JP2021016842A - Floating oil tank - Google Patents

Abstract

To provide a floating oil tank capable of efficiently recovering floating oil.SOLUTION: A floating oil tank comprises: a tank 2 in which is stored an oil-containing liquid D; a bubble generating nozzle 110 that is immersed in the liquid D and releases bubbles into the liquid D; and a floating oil collector 10 that floats on a liquid surface LS of the liquid D and recovers floating oil F.SELECTED DRAWING: Figure 1

Description

The present invention relates to a floating oil tank.

Conventionally, the configuration of Patent Document 1, for example, is known as a floating oil tank. Patent Document 1 describes a tank in which a liquid containing oil is stored and a floating oil recovery device (floating oil suction device) that floats on the liquid surface of the liquid and recovers the floating oil.

JP-A-2015-543301

The conventional floating oil tank has room for improvement in that the floating oil is efficiently recovered.

In view of the above circumstances, one of the objects of the present invention is to provide a floating oil tank capable of efficiently recovering floating oil.

One aspect of the floating oil tank of the present invention is a tank in which a liquid containing oil is stored, a bubble generating nozzle that is immersed in the liquid and discharges bubbles into the liquid, and is floated on the liquid surface of the liquid. It is provided with a floating oil recovery device for recovering floating oil.

According to the present invention, as the bubbles discharged into the liquid from the bubble generation nozzle rise, an ascending flow is generated in the liquid, and the oil component in the liquid floats to the liquid surface together with the bubbles. As a result, the separation of the oil content in the liquid and water or the like is promoted, and the floating oil can be efficiently recovered by the floating oil recovery device. Further, even when the length of the tank is short, the floating oil can be efficiently floated on the liquid surface and recovered. Therefore, the floating oil tank can be compactly configured and space can be saved. For example, the floating oil tank can be easily installed even when the installation space of the facility is limited.

It is preferable that the floating oil tank is provided with a guide means that is arranged in the tank and guides the flow of the liquid.

In this case, the flow of the liquid can be guided by the guiding means. Specifically, for example, the guide means can guide the flow of the liquid rising with the bubbles to efficiently collect the floating oil in the vicinity of the floating oil recovery device. Further, the guide means can suppress the interference between the flow of the liquid flowing into the tank from the equipment in the previous process and the flow of the liquid rising with the bubbles in the tank.

In the floating oil tank, the guide means is arranged on the downstream side of the bubble generating nozzle and on the upstream side of the floating oil recovery device in the first horizontal direction in which the liquid in the tank flows. It is preferable that the first partition plate has a first partition plate, and the upper end portion of the first partition plate is located below the liquid level.

In this case, the first partition plate is arranged on the downstream side of the bubble generating nozzle and on the upstream side of the floating oil recovery device in the first direction, and partitions between the bubble generating nozzle and the floating oil recovery device. Therefore, on the upstream side of the first partition plate, the flow of the liquid rising together with the bubbles is guided by the first partition plate, and the floating oil easily floats on the liquid surface quickly. That is, the floating oil can reach the liquid surface quickly while suppressing the flow of the oil in the liquid in the first direction. The floating oil that has floated on the liquid surface flows between the upper end of the first partition plate and the liquid surface, that is, near the liquid level to the downstream side in the first direction, and is efficiently collected near the floating oil recovery device. .. As a result, the efficiency of recovering the floating oil is further improved. Further, even when the length of the tank in the first direction is short, the floating oil can be efficiently floated on the liquid surface and recovered, and the floating oil tank can be configured more compactly.

In the floating oil tank, it is preferable that the mounting position of the first partition plate can be adjusted in at least one of the first direction and the vertical direction in the tank.

In this case, for example, the mounting position of the first partition plate in the tank can be adjusted according to the degree of contamination of the liquid (oil content) and the like, and the recovery efficiency of the floating oil can be improved.

In the floating oil tank, the tank has a pair of side walls arranged at intervals in the second direction orthogonal to the first direction in the horizontal direction, and the first partition plate has a plate shape. It is preferable to have a first main body portion and a first telescopic portion that projects from the end portion of the first main body portion in the second direction so as to be expandable and contractible in the second direction and comes into contact with the horizontal wall.

In this case, by increasing or decreasing the amount of protrusion of the first expansion / contraction portion protruding from the first main body portion in the second direction, the first expansion / contraction portion can be pressed against the side wall or separated from the side wall. That is, by expanding and contracting the first expansion / contraction portion, the first partition plate can be detachably fixed to the side wall of the tank. According to this configuration, the mounting position of the first partition plate can be finely adjusted in the tank, and the recovery efficiency of the floating oil can be further improved. Since it is not necessary to embed anchor bolts or the like in the side wall of the tank, the structure of the tank can be simplified and the mounting position of the first partition plate can be freely adjusted.

In the floating oil tank, it is preferable that the first partition plate has a first sealing portion that seals a gap between the end portion of the first main body portion in the second direction and the lateral wall.

In this case, the first sealing portion suppresses the flow of the liquid containing oil in the first direction through the gap between the end portion of the first main body portion in the second direction and the lateral wall. Therefore, the floating oil is stably floated on the liquid surface on the upstream side of the first partition plate, and the recovery efficiency of the floating oil is improved.

In the floating oil tank, the tank has a bottom wall and an upstream vertical wall connected to an upstream end of the bottom wall in the first horizontal direction in which the liquid in the tank flows. , And the guide means is provided on the upstream side of at least one of the plurality of bubble generating nozzles and on the downstream side of the upstream vertical wall in the first direction. It is preferable to have a second partition plate arranged in.

In this case, the second partition plate is arranged on the upstream side of at least one of the plurality of bubble generating nozzles and on the downstream side of the upstream vertical wall in the first direction, and at least one bubble generating nozzle and the upstream vertical wall. Partition between and. Therefore, on the downstream side of the second partition plate, the flow of the liquid rising together with the air bubbles is guided by the second partition plate, and the floating oil easily floats on the liquid surface quickly. Further, on the upstream side of the second partition plate, the liquid containing oil sent from the equipment in the previous process of the floating oil tank is allowed to flow into the tank through between the second partition plate and the vertical wall on the upstream side. That is, the second partition plate guides the rise of the liquid on the downstream side of the second partition plate, and guides the inflow (fall) of the liquid on the upstream side of the second partition plate. The second partition plate can prevent the flow of the liquid flowing into the tank from the equipment in the previous process from interfering with the flow of the liquid rising with the bubbles in the tank. As a result, the recovery efficiency of floating oil can be improved.

In the floating oil tank, it is preferable that the mounting position of the second partition plate can be adjusted in at least one of the first direction and the vertical direction in the tank.

In this case, for example, the mounting position of the second partition plate in the tank is adjusted according to the degree of liquid contamination (oil content) and the amount of inflow from the equipment in the previous process into the tank, so that the floating oil can be used. Recovery efficiency can be increased.

In the floating oil tank, the tank has a pair of side walls arranged at intervals in the second direction orthogonal to the first direction in the horizontal direction, and the second partition plate has a plate shape. It is preferable to have a second main body portion and a second telescopic portion that projects from the end portion of the second main body portion in the second direction so as to be expandable and contractible in the second direction and comes into contact with the horizontal wall.

In this case, by increasing or decreasing the amount of protrusion of the second expansion / contraction portion protruding from the second main body portion in the second direction, the second expansion / contraction portion can be pressed against the side wall or separated from the side wall. That is, by expanding and contracting the second expansion / contraction portion, the second partition plate can be detachably fixed to the side wall of the tank. According to this configuration, the mounting position of the second partition plate can be finely adjusted in the tank, and the recovery efficiency of the floating oil can be further improved. Since it is not necessary to embed anchor bolts or the like in the side wall of the tank, the structure of the tank can be simplified and the mounting position of the second partition plate can be freely adjusted.

In the floating oil tank, the second partition plate preferably has a second sealing portion that seals a gap between the end portion of the second main body portion in the second direction and the lateral wall.

In this case, the second sealing portion suppresses the flow of the liquid containing oil in the first direction through the gap between the end portion of the second main body portion in the second direction and the lateral wall. Therefore, the interference between the liquid flowing on the upstream side of the second partition plate and the liquid flowing on the downstream side is further suppressed, and the recovery efficiency of the floating oil is improved.

In the floating oil tank, the bubble generating nozzles are spaced apart from each other in the first horizontal direction in which the liquid in the tank flows and in the second horizontal direction orthogonal to the first direction. It is preferable to provide a plurality of spaces.

In this case, the oil component in the liquid can be efficiently floated on the liquid surface by a plurality of bubble generation nozzles provided at intervals in the first direction and the second direction.

In the floating oil tank, it is preferable that the bubble generating nozzle discharges bubbles upward in the liquid.

In this case, the bubbles are likely to rise smoothly to the liquid surface, and the oil content in the liquid can be floated more efficiently on the liquid surface.

In the floating oil tank, it is preferable that the bubble generating nozzle discharges microbubbles into the liquid.

In this case, since the bubble generation nozzle discharges the microbubbles into the liquid as bubbles, the oil content in the liquid is efficiently separated from water or the like by the action (function) of the microbubbles and floats on the liquid surface.

In the floating oil tank, the bubble generation nozzle has a central axis and is formed inside the cylinder, a cylinder extending in the axial direction of the central axis, an interior body arranged inside the cylinder, and the inside of the cylinder. The flow path is provided with an inflow side flow path portion located at one end of the tubular body in the axial direction and an outflow side located at the other end of the tubular body in the axial direction. A microbubble generation flow path portion that is located between the flow path portion and the inflow side flow path portion and the outflow side flow path portion in the axial direction and communicates with the inflow side flow path portion and the outflow side flow path portion. The micro-bubble generation flow path portion is formed by an inner peripheral surface of the cylinder body and an outer peripheral surface of the interior body, and the micro-bubble generation flow path portion is directed to the other side in the axial direction. A diameter-expanded flow path portion that expands in diameter according to the above, and a diameter-reduced flow path portion that is arranged on the other side of the diameter-expanded flow path portion in the axial direction and communicates with the diameter-expanded flow path portion and decreases in diameter toward the other side in the axial direction. It is preferable to have.

In this case, the micro-bubble generation flow path portion of the bubble generation nozzle has a diameter-expanded flow path portion and a diameter-reduced flow path portion. Therefore, the liquid in the bubble generation nozzle flows through the micro-bubble generation flow path portion from the diameter-expanded flow path portion to the diameter-reduction flow path portion, so that the pressure of the liquid in the flow path changes or centrifugal force acts on the liquid. Microbubbles are generated in the liquid.

According to the bubble generation nozzle having the above configuration, it is possible to generate microbubbles while simplifying the structure without forming the flow path in a spiral shape as in the conventional structure. Therefore, the bubble generation nozzle can be easily manufactured. Further, in the bubble generating nozzle having the above configuration, it is easy to keep the total length in the axial direction particularly small as compared with the conventional structure. Therefore, the outer shape of the bubble generating nozzle can be suppressed to be compact.

In the floating oil tank, the floating oil recovery device includes a float portion that floats on the liquid surface, a suction pipe portion that is supported by the float portion, and a nozzle portion that is connected to the suction pipe portion and is arranged on the liquid surface. And a suction source that is connected to the suction pipe portion and sucks the floating oil on the liquid surface from the nozzle portion through the suction pipe portion, and the nozzle portion is separated from the suction pipe portion in the horizontal direction. It is preferable to have a bottom wall portion that extends downwardly and is inserted into the liquid surface.

In this case, the bottom wall portion of the nozzle portion extends incline toward the lower side as it is separated from the suction pipe portion in the horizontal direction, and is inserted obliquely with respect to the liquid surface. Therefore, when the liquid such as floating oil and water that has run on the bottom wall is sucked diagonally upward along the inclination of the bottom wall, the liquid such as water on the bottom wall is the bottom wall. The inclination of the part makes it easier to return to the liquid level. Further, the floating oil on the bottom wall portion can be easily pulled up diagonally upward along the inclination of the bottom wall portion. As a result, the recovery amount (ratio) of liquid such as water can be reduced, and the recovery efficiency of floating oil can be improved.

The floating oil tank preferably includes a pump portion that pumps the liquid from the bottom of the tank, pressurizes it, and sends it to the bubble generation nozzle.

In this case, the pump unit pumps out the liquid from the bottom of the tank away from the liquid surface where the floating oil floats, pressurizes it and sends it to the bubble generation nozzle, and the liquid flows out into the tank together with the bubbles, so the oil content is high. A small amount of liquid can be effectively used to separate the floating oil. As a result, the running cost of the floating oil tank can be reduced. Further, since the liquid pressurized by the pump unit is sent to the bubble generation nozzle, oil and dust in the bubble generation nozzle are ejected together with the liquid to the outside of the nozzle, and clogging inside the nozzle is suppressed. Therefore, the function of the bubble generating nozzle is maintained well, and the frequency of maintenance of the bubble generating nozzle and replacement of members can be suppressed.

According to the floating oil tank of one aspect of the present invention, the floating oil can be efficiently recovered.

It is a vertical sectional view which shows the floating oil tank of 1st Embodiment. It is a top view which shows the floating oil tank of 1st Embodiment. It is an enlarged view which shows the part III of FIG. It is an enlarged view which shows the IV part of FIG. It is a front view which shows the bubble generation nozzle. It is a vertical cross-sectional view which shows the VI-VI cross section of FIG. It is a rear view which shows the bubble generation nozzle. It is a top view which shows the floating oil recovery device. It is a side view which shows the floating oil recovery device, and includes a partial schematic view. It is a side view which shows the nozzle part of the floating oil recovery device. It is a side view which shows the 1st modification of the nozzle part of FIG. It is a side view which shows the 2nd modification of the nozzle part of FIG. It is a side view which shows the 3rd modification of the nozzle part of FIG. It is (a) plan view, (b) side view, (c) front view which shows the bottom wall member of the nozzle part of FIG. It is a side view which shows the nozzle part of the floating oil recovery apparatus provided in the floating oil tank of 2nd Embodiment. It is a top view which shows the bottom wall member of the nozzle part of FIG. It is a vertical cross-sectional view which shows the bottom wall member of the nozzle part of FIG.

<First Embodiment>
The floating oil tank 1 of the first embodiment of the present invention will be described with reference to FIGS. 1 to 14.
The floating oil tank 1 of the present embodiment constitutes a part of a effluent treatment system for treating effluent (waste liquid) such as processed water of a can manufacturing factory. In the floating oil tank 1, oil, dust, etc. (hereinafter, simply referred to as “oil”) contained in the liquid D of the drainage liquid are separated from water, etc., and float on the liquid level LS of the liquid D, and are foamy, liquid, and It becomes a floating oil F in a semi-solid state or the like. The floating oil F is recovered by the floating oil recovery device 10 floating on the liquid level LS.
Although not particularly shown, the drainage treatment system has at least a pH tank and a band tank in addition to the floating oil tank 1. The pH tank is a facility provided in the pre-process of the floating oil tank 1. The pH tank has a function of adjusting the pH of the liquid D with dilute sulfuric acid or the like. The band tank is a facility provided in the subsequent process of the floating oil tank 1. The band tank has a function of aggregating and precipitating suspended substances and suspended substances contained in the liquid D by adding a flocculant such as a sulfate band (aluminum sulfate). The band tank may be rephrased as an inorganic flocculant addition tank.
The liquid D supplied to the floating oil tank 1 is not limited to the drainage of the can manufacturing factory.

As shown in FIGS. 1 and 2, the floating oil tank 1 includes a tank 2, a bubble liquid feeding pipe 3, a bubble generating nozzle 110, a pumping pipe 6, a pump unit 5, a guide means 4, and a floating oil. A recovery device 10 and a liquid feed pipe 7 for a post-process are provided.

The tank 2 has a rectangular parallelepiped container shape. The upper part of the tank 2 is open. In the top view shown in FIG. 2, the tank 2 has a rectangular shape. The liquid D containing oil is stored in the tank 2. The liquid D is flowed from the equipment (pH tank) in the previous process of the floating oil tank 1 to one end in the longitudinal direction of the tank 2 (the right end of the tank 2 in FIGS. 1 and 2). The liquid D in the tank 2 flows from one end in the longitudinal direction of the tank 2 to the other end (the left end of the tank 2 in FIGS. 1 and 2), and is sucked from the other end by the liquid feed pipe 7 for the post-process. Then, it is sent to the equipment (band tank) in the subsequent process.

In the present embodiment, the vertical direction, that is, the direction of gravity is referred to as a vertical direction. The vertical direction is the depth direction of the tank 2.
Of the horizontal directions, the direction in which the liquid D in the tank 2 flows is called the first direction FD. In the present embodiment, the first direction FD is the direction from one end (right end) to the other end (left end) in the longitudinal direction of the tank 2. The first direction FD may be referred to as a downstream side (or a downstream side of the first direction FD), and a direction opposite to the first direction FD may be referred to as an upstream side (or an upstream side of the first direction FD).
Of the horizontal directions, the direction orthogonal to the first direction FD is called the second direction SD. In the present embodiment, the second direction SD is the lateral direction, that is, the width direction of the tank 2.

The tank 2 has a bottom wall 2a, an upstream vertical wall 2b, a downstream vertical wall 2c, and a pair of horizontal walls 2d. The upstream vertical wall 2b, the downstream vertical wall 2c, and the pair of horizontal walls 2d form a peripheral wall (side wall) of the tank 2.

The bottom wall 2a is arranged at the bottom of the tank 2. The bottom wall 2a extends in the horizontal direction.
The upstream vertical wall 2b is connected to the upstream end of the bottom wall 2a in the first direction FD. The upstream vertical wall 2b extends upward from the upstream end of the bottom wall 2a. The upstream vertical wall 2b extends in a direction orthogonal to the first direction FD.

The downstream vertical wall 2c is connected to the downstream end of the bottom wall 2a in the first direction FD. The downstream vertical wall 2c extends upward from the downstream end of the bottom wall 2a. The downstream vertical wall 2c extends in a direction orthogonal to the first direction FD.
The pair of lateral walls 2d are spaced apart from each other in the second direction SD. The pair of lateral walls 2d face the second-direction SD at intervals. The pair of lateral walls 2d are connected to both ends of the bottom wall 2a in the second direction SD. The lateral wall 2d extends upward from the end of the bottom wall 2a in the second direction SD. The lateral wall 2d extends in a direction orthogonal to the second direction SD.

The liquid D pumped from the pump unit 5 flows inside the bubble liquid feeding pipe 3. In the present embodiment, the liquid D in the tank 2 is pumped out and used as the liquid D. A filter (not shown) is provided in the system between the bubble liquid feed pipe 3 and the pump unit 5. The filter captures dust and the like having a size equal to or larger than a predetermined value in the liquid D sent from the pump unit 5 to the bubble liquid feeding pipe 3.
The bubble liquid feed pipe 3 includes a first pipe portion 3a, a first branch pipe portion 3b, a second pipe portion 3c, a valve portion 3f, a second branch pipe portion 3d, and a third piping portion 3e. Has.

The first piping unit 3a is a piping unit that receives the liquid D sent from the pump unit 5 into the bubble liquid feeding pipe 3. The first piping portion 3a is arranged above the tank 2. The outlet-side end of the first piping portion 3a, that is, the outflow-side end of the liquid D, extends in the first direction FD. The outlet-side end of the first piping portion 3a is located at the center of the tank 2 in the second direction SD.

The first branch pipe portion 3b is connected to the outlet side end portion of the first piping portion 3a. The first branch pipe portion 3b is arranged above the tank 2. The first branch pipe portion 3b extends in the second direction SD. In the present embodiment, the outlet-side end of the first piping portion 3a is connected to the central portion of the second direction SD of the first branch pipe portion 3b. The pipe diameter (inner diameter) of the first branch pipe portion 3b gradually decreases as the distance from the connection portion with the first pipe portion 3a increases in the second direction SD. Specifically, the pipe diameter of the first branch pipe portion 3b becomes smaller as it is separated from the connection portion with the first piping portion 3a in the second direction SD and exceeds the connection portion with the second piping portion 3c.

A plurality of second piping portions 3c are provided. Each of the second piping portions 3c is connected to the first branch pipe portion 3b at intervals from each other in the second direction SD. In the present embodiment, a plurality of second piping portions 3c are arranged at equal pitches in the second direction SD. Each second piping portion 3c projects from the first branch pipe portion 3b in the first direction FD.

The second piping portion 3c has an upstream piping portion extending in the first direction FD and a downstream piping portion extending in the vertical direction.
The upstream end of the upstream piping section is connected to the first branch pipe section 3b. The upstream piping portion is arranged above the tank 2.
The upper end of the downstream piping section is connected to the end of the first direction FD of the upstream piping section. The downstream piping portion extends in the vertical direction from above the tank 2 to the bottom of the tank 2.

A plurality of valve portions 3f are provided. Each valve portion 3f is provided in each upstream piping portion of each second piping portion 3c. The valve portion 3f is opened and closed to allow or block the flow of the liquid D flowing inside the second piping portion 3c. By opening the valve portion 3f, the liquid D and the bubbles can be discharged from the bubble generation nozzle 110 communicating with the second piping portion 3c. By closing the valve portion 3f, the discharge of the liquid D and the bubbles from the bubble generation nozzle 110 communicating with the second piping portion 3c can be stopped.

A plurality of second branch pipe portions 3d are provided. Each second branch pipe portion 3d is connected to the lower end portion of the downstream piping portion of each second piping portion 3c. That is, the plurality of second branch pipe portions 3d are arranged at equal pitches in the present embodiment at intervals from each other in the second direction SD.
The second branch pipe portion 3d is arranged in the liquid D in the tank 2. The second branch pipe portion 3d extends in the first direction FD. In the present embodiment, the lower end of the downstream piping portion of the second piping portion 3c is connected to the central portion of the first direction FD of the second branch pipe portion 3d. The pipe diameter (inner diameter) of the second branch pipe portion 3d gradually decreases as the distance from the connection portion with the second pipe portion 3c increases in the first direction FD. Specifically, the pipe diameter of the second branch pipe portion 3d becomes smaller as it is separated from the connection portion with the second piping portion 3c in the first direction FD and exceeds the connection portion with the third piping portion 3e.

A plurality of third piping portions 3e are provided. Each third pipe portion 3e is connected to the second branch pipe portion 3d at a distance from each other in the first direction FD. In the present embodiment, a plurality of third piping portions 3e are arranged at equal pitches in the first direction FD. The third piping portion 3e projects upward from the second branch pipe portion 3d. The outlet-side end of the third piping portion 3e opens upward.
Further, the third piping portions 3e of the plurality of second branch pipe portions 3d are arranged at equal pitches in the second direction SD. That is, in the present embodiment, the plurality of third piping portions 3e are arranged at equal pitches in the first direction FD and the second direction SD, respectively.

The bubble generation nozzle 110 is connected to the outlet side end of the bubble liquid feeding pipe 3. A plurality of bubble generation nozzles 110 are provided. Each bubble generation nozzle 110 is connected to an outlet-side end of each third piping portion 3e. That is, a plurality of bubble generating nozzles 110 are provided in the first direction FD and the second direction SD at intervals from each other. In the present embodiment, the bubble generating nozzles 110 are arranged at equal pitches in the first direction FD and the second direction SD, respectively. The number of bubble generating nozzles 110 is, for example, 16 or more, and is 24 in this embodiment.

The bubble generation nozzle 110 is immersed in the liquid D in the tank 2. The bubble generation nozzle 110 discharges the liquid D sent from the bubble liquid feeding pipe 3 and the bubbles into the liquid D in the tank 2. The bubbles are created by the liquid D flowing through the bubble generating nozzle 110. The bubble generation nozzle 110 discharges bubbles upward in the liquid D in the tank 2. Specifically, the bubble generation nozzle 110 discharges microbubbles into the liquid D in the tank 2. That is, the bubbles emitted by the bubble generation nozzle 110 include microbubbles.

The bubble generation nozzle 110 is made of, for example, resin.
As shown in FIGS. 5 to 7, the bubble generation nozzle 110 has a central axis A, and includes a tubular body 111 extending in the axial direction of the central axis A, an interior body 112, a connecting cylinder 113, and a seal member 114. , A flow path 115 formed inside the tubular body 111, and the like.
The liquid D sent from the bubble liquid feed pipe 3 to the bubble generation nozzle 110 flows from one end of the cylinder 111 to the other end in the direction in which the central axis A of the cylinder 111 extends. It circulates inside the road 115.

In the present embodiment, the direction in which the central axis A of the tubular body 111 extends is referred to as an axial direction. As shown in FIG. 1, when the bubble generation nozzle 110 is immersed in the liquid D in the tank 2, the axial direction is the vertical direction. Of the axial directions, the upstream side of the liquid D flowing in the flow path 115 of the tubular body 111 is referred to as one axial side, and the downstream side is referred to as the other axial direction. In this embodiment, one side in the axial direction is the right side in FIG. 6, and the other side in the axial direction is the left side in FIG. As shown in FIG. 1, when the bubble generation nozzle 110 is immersed in the liquid D in the tank 2, one side in the axial direction is the lower side and the other side in the axial direction is the upper side.
The direction orthogonal to the central axis A is called the radial direction. Of the radial directions, the direction approaching the central axis A is called the radial inner side, and the direction away from the central axis A is called the radial outer side.
The direction of orbiting around the central axis A is called the circumferential direction.

As shown in FIGS. 5 to 7, the tubular body 111 has an outer cylinder 116, an upstream inner cylinder 117, a downstream inner cylinder 118, and a nozzle cap 119.
The outer cylinder 116 has a multi-stage tubular shape extending in the axial direction about the central axis A. The outer cylinder 116 has a small diameter cylinder portion 116a, a large diameter cylinder portion 116b, an annular plate portion 116c, and an annular recess 116e.

The small diameter tubular portion 116a has a cylindrical shape extending in the axial direction. The small diameter cylinder portion 116a is located at one end of the outer cylinder 116 on one side in the axial direction. The small-diameter tubular portion 116a has a pipe connecting screw portion 116d on the outer peripheral surface of the small-diameter tubular portion 116a. The small diameter tubular portion 116a is connected to the third piping portion 3e of the bubble liquid feeding pipe 3 by using the pipe connecting screw portion 116d.

The large-diameter tubular portion 116b has a cylindrical shape extending in the axial direction. The large-diameter cylinder portion 116b is located at a portion of the outer cylinder 116 other than the end portion on one side in the axial direction. The outer diameter of the large diameter tubular portion 116b is larger than the outer diameter of the small diameter tubular portion 116a. The inner diameter of the large-diameter tubular portion 116b is larger than the inner diameter of the small-diameter tubular portion 116a. The large-diameter tubular portion 116b has a female screw portion 116f at the end of the inner peripheral surface of the large-diameter tubular portion 116b on the other side in the axial direction.

The annular plate portion 116c has an annular plate shape centered on the central axis A, and a pair of plate surfaces face in the axial direction. Each plate surface of the annular plate portion 116c has a planar shape extending in a direction perpendicular to the central axis A. The inner peripheral portion of the annular plate portion 116c is connected to the end portion on the other side in the axial direction of the small diameter tubular portion 116a. The outer peripheral portion of the annular plate portion 116c is connected to the end portion on one side in the axial direction of the large diameter tubular portion 116b.

The annular recess 116e is arranged at a corner where the inner peripheral surface of the small diameter tubular portion 116a and the plate surface of the annular plate portion 116c facing the other side in the axial direction are connected. The annular recess 116e is located at the end of the inner peripheral surface of the small-diameter tubular portion 116a on the other side in the axial direction. The annular recess 116e is recessed radially outward from the inner peripheral surface of the small diameter tubular portion 116a and extends in the circumferential direction. The annular recess 116e is located at the inner end in the radial direction of the plate surface of the annular plate portion 116c facing the other side in the axial direction. The annular recess 116e is recessed in the axial direction from the plate surface of the annular plate portion 116c facing the other side in the axial direction, and extends in the circumferential direction. The annular recess 116e is a circular ring centered on the central axis A.

The upstream inner cylinder 117 has a tubular shape extending in the axial direction about the central axis A. The upstream inner cylinder 117 is arranged inside the outer cylinder 116. The upstream inner cylinder 117 is fitted in the large diameter cylinder portion 116b. The outer diameter of the upstream inner cylinder 117 is substantially constant along the axial direction. The inner diameter of the upstream inner cylinder 117 gradually increases toward the other side in the axial direction. The end face of the upstream inner cylinder 117 facing one side in the axial direction is a flat surface extending in a direction perpendicular to the central axis A. The end face of the upstream inner cylinder 117 facing one side in the axial direction comes into contact with the plate surface of the annular plate portion 116c facing the other side in the axial direction. The end face of the upstream inner cylinder 117 facing the other side in the axial direction is a flat surface extending in a direction perpendicular to the central axis A.

The upstream inner cylinder 117 has a diameter-expanded inner peripheral surface portion 120 on the inner peripheral surface of the upstream inner cylinder 117. That is, the tubular body 111 has an enlarged inner peripheral surface portion 120 that forms a part of the inner peripheral surface of the tubular body 111. The enlarged inner peripheral surface portion 120 is arranged over the entire inner peripheral surface of the upstream inner cylinder 117. The diameter of the inner peripheral surface portion 120 is increased toward the other side in the axial direction.

The diameter-expanded inner peripheral surface portion 120 has a first diameter-expanded uneven portion 121 whose uneven shape is repeated along the axial direction. The first diameter-expanded concave-convex portion 121 has a plurality of convex portions 121a and a plurality of concave portions 121b. In the cross-sectional view (longitudinal cross-sectional view) along the central axis A shown in FIG. 6, the convex portions 121a and the concave portions 121b are alternately arranged side by side on the first enlarged diameter uneven portion 121.

The downstream inner cylinder 118 has a tubular shape extending in the axial direction about the central axis A. The downstream inner cylinder 118 is arranged inside the outer cylinder 116. The downstream inner cylinder 118 is fitted in the large diameter cylinder portion 116b. The outer diameter of the downstream inner cylinder 118 is substantially constant along the axial direction. The inner diameter of the downstream inner cylinder 118 gradually decreases toward the other side in the axial direction. The end face of the downstream inner cylinder 118 facing one side in the axial direction is a flat surface extending in a direction perpendicular to the central axis A. The end face of the downstream inner cylinder 118 facing one side in the axial direction comes into contact with the end face of the upstream inner cylinder 117 facing the other side in the axial direction. The end face of the downstream inner cylinder 118 facing the other side in the axial direction is a flat surface extending in a direction perpendicular to the central axis A.

The downstream inner cylinder 118 has a seal groove 118a on an end surface facing the other side in the axial direction. The seal groove 118a is recessed in the axial direction from the end face of the downstream inner cylinder 118 facing the other side in the axial direction, and extends in the circumferential direction. The seal groove 118a is a circular ring centered on the central axis A.

The downstream inner cylinder 118 has a reduced diameter inner peripheral surface portion 122 on the inner peripheral surface of the downstream inner cylinder 118. That is, the tubular body 111 has a reduced diameter inner peripheral surface portion 122 that forms a part of the inner peripheral surface of the tubular body 111. The reduced diameter inner peripheral surface portion 122 is arranged over the entire circumference of the inner peripheral surface of the downstream inner cylinder 118. The reduced diameter inner peripheral surface portion 122 is arranged on the other side in the axial direction of the expanded inner peripheral surface portion 120, and the diameter is reduced toward the other side in the axial direction.

The reduced-diameter inner peripheral surface portion 122 has a first reduced-diameter uneven portion 123 in which the concave-convex shape is repeated along the axial direction. The first reduced-diameter concavo-convex portion 123 has a plurality of convex portions 123a and a plurality of concave portions 123b. In the vertical cross-sectional view shown in FIG. 6, the convex portions 123a and the concave portions 123b are alternately arranged side by side on the first reduced diameter uneven portion 123.

The nozzle cap 119 has a substantially columnar shape or a substantially plate shape centered on the central axis A. The nozzle cap 119 has a cap main body portion 119a, a protruding portion 119b, a fitting shaft 119c, and a ejection hole 119d.

The cap body portion 119a has a substantially disk shape centered on the central axis A. The plate surface of the cap body 119a facing one side in the axial direction is a flat surface extending in a direction perpendicular to the central axis A. The plate surface of the cap body 119a facing one side in the axial direction comes into contact with the end surface of the inner cylinder 118 on the downstream side facing the other side in the axial direction. The cap main body 119a has a male screw portion 119e on the outer peripheral surface of the cap main body 119a. The male threaded portion 119e is screwed to the female threaded portion 116f of the large diameter tubular portion 116b.

The projecting portion 119b projects from the plate surface of the cap body portion 119a facing the other side in the axial direction to the other side in the axial direction. The protruding portion 119b has a substantially conical shape centered on the central axis A and extends in the axial direction. The outer diameter of the protruding portion 119b decreases toward the other side in the axial direction. The protruding portion 119b protrudes to the other side in the axial direction from the opening on the other side in the axial direction of the ejection hole 119d.

The fitting shaft 119c projects from the plate surface of the cap body 119a facing one side in the axial direction to one side in the axial direction. The fitting shaft 119c has a columnar shape centered on the central shaft A and extends in the axial direction.

The ejection hole 119d penetrates the nozzle cap 119 in the axial direction. The ejection hole 119d has a circular hole shape. The ejection hole 119d has an opening on one side in the axial direction and an opening on the other side in the axial direction. The opening on one side of the ejection hole 119d in the axial direction is located radially outside the fitting shaft 119c. The opening on one side of the ejection hole 119d in the axial direction expands in diameter toward one side in the axial direction. The opening on the other side of the ejection hole 119d in the axial direction is located radially outside the protrusion 119b.
A plurality of ejection holes 119d are provided in the nozzle cap 119. The plurality of ejection holes 119d are arranged at equal pitches in the circumferential direction around the central axis A. In the present embodiment, 12 ejection holes 119d are arranged at equal intervals in the circumferential direction.

The interior body 112 is arranged inside the tubular body 111. The interior body 112 is arranged inside the upstream inner cylinder 117 and the downstream inner cylinder 118 in the radial direction. The interior body 112 has a substantially columnar shape or a substantially plate shape centered on the central axis A. The outer diameter of the interior body 112 increases from both ends in the axial direction toward the center. The end face of the interior body 112 facing one side in the axial direction is a flat surface extending in a direction perpendicular to the central axis A. The end face of the interior body 112 facing the other side in the axial direction is a flat surface extending in a direction perpendicular to the central axis A. The end face of the interior body 112 facing the other side in the axial direction comes into contact with the plate surface of the cap body portion 119a facing the other side in the axial direction.

The interior body 112 has an enlarged outer peripheral surface portion 124, a reduced diameter outer peripheral surface portion 125, a protrusion 112a, a fitting hole 112b, and an annular groove portion 112c.
The enlarged diameter outer peripheral surface portion 124 constitutes a portion on one side in the axial direction of the outer peripheral surface of the interior body 112. That is, the expanded outer peripheral surface portion 124 constitutes a part of the outer peripheral surface of the interior body 112. The enlarged diameter outer peripheral surface portion 124 is arranged over the entire circumference in the circumferential direction on one side of the outer peripheral surface of the interior body 112 in the axial direction. The diameter of the outer peripheral surface portion 124 is increased toward the other side in the axial direction. The enlarged diameter outer peripheral surface portion 124 is arranged to face the enlarged diameter inner peripheral surface portion 120 with a gap.

The diameter-expanded outer peripheral surface portion 124 has a second diameter-expanded concave-convex portion 126 in which the concave-convex shape is repeated along the axial direction. The second diameter-expanded concave-convex portion 126 has a plurality of convex portions 126a and a plurality of concave portions 126b. In the vertical cross-sectional view shown in FIG. 6, the convex portions 126a and the concave portions 126b are alternately arranged side by side on the second enlarged diameter uneven portion 126.
The convex portion 121a of the first diameter-expanded concave-convex portion 121 and the convex portion 126a of the second enlarged-diameter concave-convex portion 126 are arranged so as to face each other. The recess 121b of the first diameter-expanded uneven portion 121 and the recess 126b of the second diameter-expanded uneven portion 126 are arranged so as to face each other.

The reduced diameter outer peripheral surface portion 125 constitutes a portion of the outer peripheral surface of the interior body 112 on the other side in the axial direction. That is, the reduced diameter outer peripheral surface portion 125 constitutes a part of the outer peripheral surface of the interior body 112. The reduced diameter outer peripheral surface portion 125 is arranged on the other side of the outer peripheral surface of the interior body 112 in the axial direction over the entire circumference in the circumferential direction. The reduced diameter outer peripheral surface portion 125 is arranged on the other side in the axial direction of the expanded outer peripheral surface portion 124, and the diameter is reduced toward the other side in the axial direction. The reduced diameter outer peripheral surface portion 125 is arranged to face the reduced diameter inner peripheral surface portion 122 with a gap.

The reduced-diameter outer peripheral surface portion 125 has a second reduced-diameter uneven portion 127 in which the concave-convex shape is repeated along the axial direction. The second reduced-diameter concavo-convex portion 127 has a plurality of convex portions 127a and a plurality of concave portions 127b. In the vertical cross-sectional view shown in FIG. 6, the convex portions 127a and the concave portions 127b are alternately arranged side by side on the second reduced diameter concave-convex portion 127.
The convex portion 123a of the first reduced-diameter concavo-convex portion 123 and the convex portion 127a of the second reduced-diameter concavo-convex portion 127 are arranged so as to face each other. The recess 123b of the first reduced-diameter concavo-convex portion 123 and the recess 127b of the second reduced-diameter concavo-convex portion 127 are arranged so as to face each other.

The protrusion 112a projects from the end face of the interior body 112 facing one side in the axial direction to one side in the axial direction. The protrusion 112a has a substantially conical shape centered on the central axis A and extends in the axial direction. The outer diameter of the protruding portion 112a decreases toward one side in the axial direction.

The fitting hole 112b is recessed from the end face of the interior body 112 facing the other side in the axial direction to one side in the axial direction. The fitting hole 112b has a circular hole shape centered on the central axis A and extends in the axial direction. The fitting shaft 119c is fitted in the fitting hole 112b.

The annular groove portion 112c is recessed from the end face of the interior body 112 facing one side in the axial direction to the other side in the axial direction, and extends in the circumferential direction. The annular groove portion 112c is a circular ring centered on the central axis A. The annular groove portion 112c is located radially outside the protrusion 112a. The annular groove portion 112c is located on the other side of the annular recess 116e in the axial direction and faces the annular recess 116e at a distance in the axial direction.

The connecting cylinder 113 has a cylindrical shape extending in the axial direction about the central axis A. The connecting cylinder 113 connects the cylinder 111 and the interior body 112. One end of the connecting cylinder 113 in the axial direction is fitted in the annular recess 116e. In the present embodiment, the end portion on one side in the axial direction of the connecting cylinder 113 is also fitted radially inside the end portion on one side in the axial direction of the upstream inner cylinder 117. The end of the connecting cylinder 113 on the other side in the axial direction fits into the annular groove portion 112c.

The connecting cylinder 113 has a connecting hole 113a that penetrates the peripheral wall of the connecting cylinder 113 in the radial direction. A plurality of connection holes 113a are provided in the connecting cylinder 113. The plurality of connection holes 113a are arranged at equal pitches in the circumferential direction around the central axis A. In the present embodiment, 12 connection holes 113a are arranged at equal intervals in the circumferential direction.

The seal member 114 has a circular ring shape centered on the central axis A. The seal member 114 is an elastic member such as an O-ring. The seal member 114 is arranged in the seal groove 118a. The seal member 114 comes into contact with the plate surface of the cap body 119a facing one side in the axial direction.

The flow path 115 is arranged inside the tubular body 111 and penetrates the tubular body 111 in the axial direction. The liquid D flows into the flow path 115 from the bubble liquid feeding pipe 3. The liquid D flows in the flow path 115 from the end on one side in the axial direction toward the end on the other side in the axial direction.
The flow path 115 includes an inflow side flow path 130 located at one end of the tubular body 111 in the axial direction, an outflow side flow path 131 located at the other end of the tubular body 111 in the axial direction, and a shaft. It has a microbubble generation flow path portion 132 that is located between the inflow side flow path portion 130 and the outflow side flow path portion 131 in the direction and communicates with the inflow side flow path portion 130 and the outflow side flow path portion 131.

The inflow side flow path portion 130 is formed by an inner peripheral surface of the small diameter tubular portion 116a, an inner peripheral surface of the connecting cylinder 113 and a connection hole 113a, and an end surface and a protrusion 112a of the interior body 112 facing one side in the axial direction. Will be done. The inflow side flow path portion 130 has a plurality of connection flow path portions 130a located at the end on the other side in the axial direction of the inflow side flow path portion 130 and connected to the microbubble generation flow path portion 132. Each connection flow path portion 130a is formed by each connection hole 113a. The plurality of connection flow path portions 130a are arranged at equal pitches in the circumferential direction around the central axis A. In this embodiment, 12 connecting flow path portions 130a are arranged at equal intervals in the circumferential direction.

The outflow side flow path portion 131 has a plurality of ejection flow path portions 131a connected to the micro bubble generation flow path portion 132. Each ejection flow path portion 131a is formed by each ejection hole 119d. The plurality of ejection flow path portions 131a are arranged at equal pitches in the circumferential direction around the central axis A. In the present embodiment, twelve ejection flow path portions 131a are arranged at equal intervals in the circumferential direction.

The micro-bubble generation flow path portion 132 is formed by an inner peripheral surface of the tubular body 111 and an outer peripheral surface of the inner body 112. The micro-bubble generation flow path portion 132 is an annular shape extending in the circumferential direction around the central axis A. The micro-bubble generation flow path portion 132 is arranged between the upstream inner cylinder 117 and the downstream inner cylinder 118 and the interior body 112 in the radial direction.
The micro-bubble generation flow path portion 132 has an enlarged flow path portion 132a and a reduced diameter flow path portion 132b.

The diameter-expanded flow path portion 132a expands in diameter toward the other side in the axial direction. The enlarged diameter flow path portion 132a is located on one side in the axial direction of the micro bubble generation flow path portion 132. The diameter-expanded flow path portion 132a is formed by the diameter-expanded inner peripheral surface portion 120 and the diameter-expanded outer peripheral surface portion 124.

The diameter-reduced flow path portion 132b is arranged on the other side of the diameter-expanded flow path portion 132a in the axial direction, communicates with the diameter-expanded flow path portion 132a, and reduces in diameter toward the other side in the axial direction. The reduced diameter flow path portion 132b is located on the other side in the axial direction of the micro bubble generation flow path portion 132. The reduced diameter flow path portion 132b is formed by a reduced diameter inner peripheral surface portion 122 and a reduced diameter outer peripheral surface portion 125.

As shown in FIGS. 1 and 2, the pumping pipe 6 is a pipe for pumping the liquid D in the tank 2. The pumping pipe 6 is connected to the pump unit 5. The pumping pipe 6 pumps out the liquid D at the bottom of the tank 2 located in the first direction FD from the first partition plate 8 described later of the guide means 4 in the tank 2, and sends the liquid D to the pump unit 5.

The pump unit 5 pumps the liquid D from the bottom of the tank 2 through the pumping pipe 6, pressurizes the liquid D, and sends the liquid D to the bubble generation nozzle 110 through the bubble liquid feeding pipe 3. The pump unit 5 is a circulation pump that pumps up the liquid D in the tank 2 and returns it from the bubble generation nozzle 110 into the tank 2.

The guide means 4 is arranged in the tank 2 to guide the flow of the liquid D. In the present embodiment, the guide means 4 guides the flow of bubbles discharged from the bubble generation nozzle 110 and the ascending flow of the liquid D generated by the flow of the bubbles. Further, the guide means 4 guides the downward flow of the liquid D flowing into the tank 2 from the equipment (pH tank) in the previous process of the floating oil tank 1.
The guide means 4 has a first partition plate 8 and a second partition plate 9.

The first partition plate 8 is arranged on the downstream side of the bubble generation nozzle 110 and on the upstream side of the floating oil recovery device 10 in the first direction FD. The first partition plate 8 has a plate shape extending in a direction orthogonal to the first direction FD. In the present embodiment, the first partition plate 8 has a quadrangular plate shape.

In the first partition plate 8, the upper end portion of the first partition plate 8 is located below the liquid level LS. That is, the entire first partition plate 8 is arranged in the liquid D in the tank 2. The floating oil F that has floated from the liquid D can be circulated in the first direction FD through the upper side of the upper end portion of the first partition plate 8.
The first partition plate 8 is arranged so that the lower end portion of the first partition plate 8 is separated from the bottom wall 2a on the upper side. A gap is provided in the vertical direction between the lower end of the first partition plate 8 and the bottom wall 2a. Through this gap, the liquid D at the bottom of the tank 2 can flow to the upstream side of the first direction FD.

The mounting position of the first partition plate 8 can be adjusted in at least one of the first direction FD and the vertical direction in the tank 2. In the present embodiment, the mounting position of the first partition plate 8 can be adjusted in the first direction FD in the tank 2, and the mounting position can also be adjusted in the vertical direction. That is, the position of the first partition plate 8 can be adjusted in the tank 2 in the first direction FD, the vertical direction, and the direction (oblique direction) in which the first direction FD and the vertical direction are combined.

As shown in FIG. 3, the first partition plate 8 is formed so as to extendably project from the plate-shaped first main body portion 8a and the end portion of the first main body portion 8a of the second direction SD to the second direction SD. It has a first expansion / contraction portion 8b that contacts the lateral wall 2d, and a first sealing portion 8c that seals a gap between the end portion of the second direction SD of the first main body portion 8a and the lateral wall 2d.

The first main body portion 8a has a quadrangular plate shape that extends in a direction perpendicular to the first direction FD. The length of the second-direction SD of the first main body 8a is smaller than the distance of the second-direction SD between the pair of lateral walls 2d. The vertical length of the first main body 8a is smaller than the vertical distance between the bottom wall 2a and the liquid level LS, that is, the depth of the liquid D in the tank 2.

In the present embodiment, the first telescopic portion 8b is provided at the end of the first main body portion 8a in the second direction SD by screwing. By adjusting the amount of screwing of the first telescopic portion 8b into the second direction SD with respect to the first main body portion 8a, the amount of protrusion of the first telescopic portion 8b from the first main body portion 8a to the second direction SD is adjusted. It is possible.
The first telescopic portion 8b is, for example, a rubber base adjuster or the like.

A plurality of first expansion / contraction portions 8b are provided. The plurality of first telescopic portions 8b are arranged at the ends of the second direction SD of the first main body portion 8a at intervals in the vertical direction, and are arranged at equal pitches in the present embodiment. Further, the first expansion / contraction portion 8b is provided at both ends of the second direction SD of the first main body portion 8a, respectively. That is, the plurality of first expansion / contraction portions 8b are projected from both ends of the second direction SD of the first main body portion 8a toward the outside of the second direction SD.

The first expansion / contraction portion 8b has a first screw portion 8d screwed to the first main body portion 8a, and a first contact portion 8e fixed to the first screw portion 8d and in contact with the side wall 2d.
The outer diameter of the first contact portion 8e is larger than the outer diameter of the first screw portion 8d. The portion of the first contact portion 8e that directly contacts the side wall 2d is made of, for example, resin or rubber. By adjusting the screwing amount of the first screw portion 8d and pressing the first contact portion 8e against the lateral wall 2d, the first partition plate 8 is brought into a state of being stretched in the second direction SD between the pair of lateral walls 2d. It is fixed in the tank 2.

The first sealing portion 8c has a plate shape that can be elastically deformed. The first sealing portion 8c is made of, for example, rubber or resin. The first sealing portion 8c has a rectangular plate shape extending in the vertical direction, and a pair of plate surfaces face the upstream side and the downstream side of the first direction FD. The vertical length of the first sealing portion 8c is substantially the same as the vertical length of the first main body portion 8a.

The first sealing portion 8c is fixed to the plate surface of the first main body portion 8a facing the upstream side of the first direction FD. Specifically, of both ends of the second direction SD of the first sealing portion 8c, the inner (center side) ends of the second direction SD are fixed to the first main body portion 8a by a screw member or the like. .. By being elastically deformed, the first sealing portion 8c is curved and extends toward the upstream side of the first direction FD from the inner end portion of the second direction SD toward the outside of the second direction SD. The outer end of the first sealing portion 8c in the second direction SD comes into close contact with the lateral wall 2d in an elastically deformed state. As a result, the first sealing portion 8c seals the gap between the end portion of the second direction SD of the first main body portion 8a and the side wall 2d, and the liquid D flows through the gap to the first direction FD. Block or suppress.
A plurality (pair) of first sealing portions 8c are provided. The plurality of first sealing portions 8c are provided at both ends of the second direction SD of the first main body portion 8a, respectively.

As shown in FIGS. 1 and 2, the second partition plate 9 is arranged on the upstream side of at least one of the plurality of bubble generating nozzles 110 and on the downstream side of the upstream vertical wall 2b in the first direction FD. Nozzle. In the present embodiment, the second partition plate 9 is a bubble generation nozzle 110 (4 bubble generation nozzles 110) located at the upstream end of the first direction FD among a plurality of (24) bubble generation nozzles 110. It is arranged on the upstream side of the first direction FD with respect to the bubble generating nozzles 110 (20 bubble generating nozzles 110) other than the above. The second partition plate 9 is arranged away from the first partition plate 8 on the upstream side of the first direction FD. The second partition plate 9 has a plate shape extending in a direction orthogonal to the first direction FD. In the present embodiment, the second partition plate 9 has a quadrangular plate shape.

In the second partition plate 9, the upper end portion of the second partition plate 9 projects upward from the liquid level LS. A portion of the second partition plate 9 other than the upper end is arranged in the liquid D in the tank 2. The floating oil F that has floated on the liquid level LS from the liquid D on the downstream side of the first direction FD of the second partition plate 9 is partitioned by the second partition plate 9 so that the first direction FD of the second partition plate 9 It does not circulate to the upstream side of.
In the second partition plate 9, the lower end portion of the second partition plate 9 is arranged so as to be separated from the bottom wall 2a on the upper side. The lower end of the second partition plate 9 is located above the lower end of the first partition plate 8.

The mounting position of the second partition plate 9 can be adjusted in at least one of the first direction FD and the vertical direction in the tank 2. In the present embodiment, the mounting position of the second partition plate 9 can be adjusted in the first direction FD in the tank 2, and the mounting position can also be adjusted in the vertical direction. That is, the position of the second partition plate 9 can be adjusted in the tank 2 in the first direction FD, the vertical direction, and the direction (oblique direction) in which the first direction FD and the vertical direction are combined.

As shown in FIG. 4, the second partition plate 9 is formed so as to extendably project from the plate-shaped second main body portion 9a and the end of the second main body portion 9a to the second direction SD. It has a second telescopic portion 9b that comes into contact with the lateral wall 2d, and a second sealing portion 9c that seals a gap between the end portion of the second direction SD of the second main body portion 9a and the lateral wall 2d.

The second main body portion 9a has a quadrangular plate shape that extends in a direction perpendicular to the first direction FD. The length of the second direction SD of the second main body portion 9a is smaller than the distance of the second direction SD between the pair of side walls 2d. The vertical length of the portion of the second main body portion 9a arranged in the liquid D is smaller than the vertical distance between the bottom wall 2a and the liquid surface LS, that is, the depth of the liquid D in the tank 2.

In the present embodiment, the second telescopic portion 9b is provided at the end of the second main body portion 9a of the second direction SD by screwing. By adjusting the amount of screwing of the second telescopic portion 9b into the second direction SD with respect to the second main body portion 9a, the amount of protrusion of the second telescopic portion 9b from the second main body portion 9a to the second direction SD is adjusted. It is possible.
The second telescopic portion 9b is, for example, a rubber base adjuster or the like. In the present embodiment, the second telescopic portion 9b and the first telescopic portion 8b are common parts.

A plurality of second expansion / contraction portions 9b are provided. The plurality of second telescopic portions 9b are arranged at the ends of the second direction SD of the second main body portion 9a at intervals in the vertical direction, and are arranged at equal pitches in the present embodiment. Further, the second expansion / contraction portion 9b is provided at both ends of the second direction SD of the second main body portion 9a, respectively. That is, the plurality of second telescopic portions 9b are projected from both ends of the second direction SD of the second main body portion 9a toward the outside of the second direction SD.

The second telescopic portion 9b has a second screw portion 9d screwed to the second main body portion 9a, and a second contact portion 9e fixed to the second screw portion 9d and in contact with the lateral wall 2d.
The outer diameter of the second contact portion 9e is larger than the outer diameter of the second screw portion 9d. The portion of the second contact portion 9e that directly contacts the side wall 2d is made of, for example, resin or rubber. By adjusting the screwing amount of the second screw portion 9d and pressing the second contact portion 9e against the lateral wall 2d, the second partition plate 9 is brought into a state of being stretched in the second direction SD between the pair of lateral walls 2d. It is fixed in the tank 2.

The second sealing portion 9c has a plate shape that can be elastically deformed. The second sealing portion 9c is made of, for example, rubber or resin. The second sealing portion 9c has a rectangular plate shape extending in the vertical direction, and a pair of plate surfaces face the upstream side and the downstream side of the first direction FD. The vertical length of the second sealing portion 9c is substantially the same as the vertical length of the second main body portion 9a.

The second sealing portion 9c is fixed to the plate surface of the second main body portion 9a facing the upstream side of the first direction FD. Specifically, of both ends of the second direction SD of the second sealing portion 9c, the inner (center side) ends of the second direction SD are fixed to the second main body portion 9a by a screw member or the like. .. By being elastically deformed, the second sealing portion 9c is curved and extends toward the upstream side of the first direction FD from the inner end portion of the second direction SD toward the outside of the second direction SD. The outer end of the second sealing portion 9c in the second direction SD comes into close contact with the lateral wall 2d in an elastically deformed state. As a result, the second sealing portion 9c seals the gap between the end portion of the second direction SD of the second main body portion 9a and the side wall 2d, and the liquid D flows through the gap to the first direction FD. Block or suppress.
A plurality (pair) of second sealing portions 9c are provided. A plurality of second sealing portions 9c are provided at both ends of the second direction SD of the second main body portion 9a, respectively.

As shown in FIGS. 1 and 2, the floating oil recovery device 10 floats on the liquid level LS of the liquid D in the tank 2 and recovers the floating oil F.
As shown in FIGS. 8 and 9, the floating oil recovery device 10 includes a suction pipe portion 12, a tube 18, a float portion 13, a nozzle portion 14, a suction source 17, and a floating oil recovery tank 19. Be prepared.

The suction pipe portion 12 is connected to the nozzle portion 14 that sucks the floating oil F. The suction tube portion 12 is provided between the nozzle portion 14 and the suction source 17 such as a suction pump. The suction pipe portion 12 constitutes a part of the flow path (pipeline) of the suction pipe that sucks the floating oil F. The suction pipe portion 12 is a portion of the suction pipe (whole) located near the liquid level LS. The float portion 13 floats on the liquid level LS. The float portion 13 supports the suction pipe portion 12 and the nozzle portion 14. The nozzle portion 14 is arranged on the liquid level LS. When the water level of the liquid D (the vertical position of the liquid level LS) fluctuates, the float portion 13 moves in the vertical direction according to the water level. In the float portion 13, the nozzle portion 14 and the suction pipe portion 12 are arranged in the vicinity of the liquid level LS regardless of (the fluctuation) of the water level of the liquid D.

In the following description, in FIGS. 8 to 14 showing the floating oil recovery device 10 of the present embodiment, the vertical direction is shown as the Z direction.
Further, of the horizontal directions, the direction in which the nozzle portion 14 extends is called the front-rear direction, and is shown as the X direction. Of the front-back directions, the right side of the paper surface in FIG. 8 is called the front side (+ X side), and the left side of the paper surface is called the rear side (−X side). Further, among the front-rear directions, the direction away from the suction tube portion 12 is referred to as the outside, and the direction approaching the suction tube portion 12 is referred to as the inside. That is, in the front-rear direction, the direction from the suction tube portion 12 toward the tip of the nozzle portion 14 is called the outside, and the direction from the tip of the nozzle portion 14 toward the suction tube portion 12 is called the inside.

Further, the direction orthogonal to the vertical direction and the front-back direction is called the width direction and is shown as the Y direction. The width direction is a horizontal direction orthogonal to the front-rear direction. In the width direction, the upper side of the paper surface in FIG. 8 is called the left side (+ Y side), and the lower side of the paper surface is called the right side (−Y side).

The above-mentioned vertical direction (upper side, lower side), front-back direction (front side, rear side, inner side, outer side) and width direction (left side, right side) are merely names for explaining the relative positional relationship of each part, and are actual names. The arrangement relationship, etc. is not limited to the arrangement relationship, etc. indicated by these names.

The suction tube portion 12 is arranged above the liquid level LS and on the liquid level LS. The suction pipe portion 12 has a portion extending in the vertical direction from above the tank 2 toward the liquid level LS (main pipe 21) and a portion extending in the horizontal direction along the liquid level LS (branch pipe 22). In the example of this embodiment, the suction pipe portion 12 is a pipe (circular pipe, round pipe) having a circular cross section. The suction tube portion 12 is made of, for example, a synthetic resin such as impact-resistant rigid polyvinyl chloride (HI-PVC) or vinyl chloride.

A flexible tube 18 is connected to the upper end of the suction tube portion 12. The tube 18 has a tubular shape. The tube 18 is directly or indirectly connected to the suction source 17 and the floating oil recovery tank 19. That is, the suction pipe portion 12 is connected to the suction source 17 and the floating oil recovery tank 19 via the tube 18. The tube 18 is soft and allows the floating oil recovery device 10 to move (flow) in the horizontal direction on the liquid level LS. Further, the tube 18 allows the floating oil recovery device 10 to move up and down according to the fluctuation of the water level of the liquid level LS.

The suction pipe portion 12 has a main pipe 21 and a plurality of branch pipes 22.
The main pipe 21 is a portion of the suction pipe portion 12 extending upward from the vicinity of the liquid level LS. That is, the main pipe 21 is a portion of the suction pipe portion 12 that extends in the vertical direction. A tube 18 is connected to the upper end of the main pipe 21. The lower end of the main pipe 21 is connected to the branch pipe 22.

In the example of this embodiment, a pair of branch pipes 22 is provided. The branch pipe 22 is a portion of the suction pipe portion 12 that branches from the main pipe 21 in the vicinity of the liquid level LS and extends in the horizontal direction (width direction in the present embodiment). The branch pipe 22 is arranged at the liquid level LS and extends along the liquid level LS. The branch pipe 22 connects to the lower end of the main pipe 21 and communicates with the main pipe 21. The pair of branch pipes 22 are arranged on both sides (left side and right side) in the width direction with the main pipe 21 interposed therebetween. A cap 23 is attached to the tip end portion (end portion in the width direction) of the branch pipe 22. The cap 23 closes the end of the branch pipe 22 in the width direction.

As shown in FIG. 10, a suction hole 22h is opened on the outer peripheral surface of the branch pipe 22. The suction hole 22h is a through hole that penetrates the peripheral wall of the branch pipe 22, and is slit-shaped in the example of the present embodiment. The suction hole 22h is arranged in a portion (upper portion) of the peripheral wall of the branch pipe 22 located above the central axis C of the branch pipe 22 and extends in the horizontal direction (width direction in the present embodiment). A plurality of suction holes 22h (a pair in the example of the present embodiment) are provided in the upper portion of the branch pipe 22 at intervals in the front-rear direction. The central axis C and the suction hole 22h of the branch pipe 22 are located above the liquid level LS.

As shown in FIG. 10, when viewed along the central axis C of the branch pipe 22 (viewed from the central axis C direction), the hole center line HL of the suction hole 22h is inclined with respect to the vertical axis VA passing through the central axis C. The angle θ1 is, for example, 35 to 70 °. The angle θ1 is preferably 45 to 60 °. In the illustrated example, the angles θ1 of the pair of suction holes 22h provided in one branch pipe 22 are the same as each other. However, the present invention is not limited to this, and the angles θ1 of the pair of suction holes 22h may be different from each other.
A nozzle portion 14 is connected to the branch pipe 22 so as to cover the suction hole 22h. The nozzle portion 14 surrounds the suction hole 22h from the vertical direction, the front-rear direction, and the width direction.

As shown in FIGS. 8 and 9, the float portion 13 is connected to the main pipe 21 of the suction pipe portion 12 and floats on the liquid level LS of the liquid D. In other words, the suction tube portion 12 floats on the liquid level LS by being supported by the float portion 13.
A plurality of float portions 13 are provided. In the example of this embodiment, four float portions 13 are provided and each is connected to the suction pipe portion 12. The plurality of float portions 13 are arranged on both sides (front side, rear side) in the front-rear direction and both sides (left side, right side) in the width direction with the main pipe 21 as the center. In a plan view (top view) of the floating oil recovery device 10 shown in FIG. 8, the four float portions 13 are arranged around the main pipe 21 at equal intervals (90 ° intervals).

The float portion 13 has a float main body 31 that floats on the liquid surface LS and a float support portion 32 that supports the float main body 31.
The float body 31 is made of resin, for example, and has a lower specific gravity than the liquid D. The float body 31 is made of a foamed resin such as Styrofoam. The float body 31 may be, for example, a hollow structure having a resin outer shell, wooden or the like. In the example of this embodiment, the float body 31 has a barrel shape or a rugby ball shape. The float main body 31 arranged on the front side and the rear side of the main pipe 21 extends in the width direction. The float main body 31 arranged on the left side and the right side of the main pipe 21 extends in the front-rear direction. The float body 31 has a central hole 31h that penetrates the float body 31 in the horizontal direction (longitudinal direction of the float body 31).

The float support portion 32 is connected to the float main body 31. The float support portion 32 has a shaft 33 extending in the horizontal direction, and the shaft 33 is passed through the float main body 31. The shaft 33 is inserted into the central hole 31h of the float body 31 and protrudes from both ends of the float body 31 in the longitudinal direction. The float support portion 32 connects the float main body 31 and the main pipe 21.

Specifically, the float support portion 32 is formed with a through hole that penetrates the float support portion 32 in the vertical direction, and the main pipe 21 is inserted into the through hole. The main pipe 21 is arranged above the upper stopper 35 of the float support portion 32 where the through hole is formed and below the portion of the float support portion 32 where the through hole is formed. A lower stopper 36 is provided.

The upper stopper 35 has a circular ring shape, and the main pipe 21 is inserted into the upper stopper 35. The upper stopper 35 is fixed to the main pipe 21 by tightening the fixing screw of the upper stopper 35. The upper stopper 35 comes into contact with the float support portion 32 from above. The upper stopper 35 restricts the upward movement of the float support portion 32 with respect to the main pipe 21. By loosening the fixing screw of the upper stopper 35 and releasing the fixed state to the main pipe 21, the float support portion 32 is allowed to move upward with respect to the main pipe 21.

The lower stopper 36 has a circular ring shape, and the main pipe 21 is inserted into the lower stopper 36. The lower stopper 36 is fixed to the main pipe 21 by tightening the fixing screw of the lower stopper 36. The lower stopper 36 comes into contact with the float support portion 32 from below. The lower stopper 36 restricts the downward movement of the float support portion 32 with respect to the main pipe 21. By loosening the fixing screw of the lower stopper 36 and releasing the fixed state to the main pipe 21, the float support portion 32 is allowed to move downward with respect to the main pipe 21.
In this way, the float support portion 32 is fixed to the portion (main pipe 21) extending in the vertical direction of the suction pipe portion 12 so that the position in the vertical direction can be adjusted.

The nozzle portion 14 is floated on the liquid level LS of the liquid D and sucks the floating oil F. A plurality of nozzle portions 14 are provided. The nozzle portion 14 is provided in each of the plurality of branch pipes 22. In the example of this embodiment, the number of nozzle portions 14 (2) is the same as the number of branch pipes 22 (2). One nozzle portion 14 is provided on each of the pair of branch pipes 22. The pair of nozzle portions 14 are arranged apart from each other in the horizontal direction (width direction in the present embodiment). In the present embodiment, the nozzle portion 14 is made of stainless steel such as SUS304.

As shown in FIG. 10, the nozzle portion 14 has a mounting portion 41 fixed to the branch pipe 22 and a pair of suction nozzles 42 extending in the front-rear direction from the mounting portion 41.
The mounting portion 41 has a plate shape. The attachment portion 41 covers a part of the branch pipe 22 in the width direction from above. The attachment portion 41 has an arch shape straddling the upper portion of the branch pipe 22 in the front-rear direction, and supports a pair of suction nozzles 42 on the front side and the rear side of the branch pipe 22.

The mounting portion 41 has a fixed wall portion 41a and a pair of inclined wall portions 41b connected to both ends of the fixed wall portion 41a in the front-rear direction.
The fixed wall portion 41a extends in a direction perpendicular to the vertical direction (horizontal direction). The fixed wall portion 41a is fixed to the upper end portion of the outer peripheral surface of the branch pipe 22 by screwing or the like.

The inclined wall portion 41b is arranged to face the suction hole 22h with a gap between it and the suction hole 22h of the branch pipe 22. The inclined wall portion 41b is inclined and extends downward from the connecting portion with the fixed wall portion 41a so as to be outward in the front-rear direction. The inclined wall portion 41b is arranged with a distance of, for example, about 5 to 15 mm from the suction hole 22h. This distance is preferably 8-12 mm. As shown in FIG. 10, when viewed from the central axis C direction of the branch pipe 22 (or in a cross-sectional view perpendicular to the central axis C), the distance between the inclined wall portion 41b and the suction hole 22h is the suction hole 22h. It is smaller than the hole width (opening width). However, not limited to this, the distance between the inclined wall portion 41b and the suction hole 22h may be larger than or the same as the hole width of the suction hole 22h.

The suction nozzle 42 has a tubular shape extending in the horizontal direction. In the example of this embodiment, the suction nozzle 42 has a square tubular shape extending in the front-rear direction. The suction nozzle 42 has a flat square tube shape. The shape of the cross section perpendicular to the front-rear direction of the suction nozzle 42 is rectangular. The shape of the cross section perpendicular to the front-rear direction of the suction nozzle 42 is a quadrangular shape in which the length in the width direction is larger than the length in the up-down direction.

The suction nozzle 42 is arranged along the liquid level LS. The lower end of the suction nozzle 42 is located below the liquid level LS, and the portion other than the lower end (the portion located above the lower end) is located above the liquid level LS. That is, the nozzle portion 14 has a portion located below the liquid level LS and a portion located above the liquid level LS. The tip end portion (outer end portion in the front-rear direction) of the suction nozzle 42 opens to the liquid level LS. The suction nozzle 42 has an opening at the tip of the suction nozzle 42. The lower end of the opening of the suction nozzle 42 is immersed under the liquid level LS, and the portion other than the lower end is exposed on the liquid level LS. Liquids such as floating oil F and water on the liquid level LS can enter the suction nozzle 42 through the opening.

The suction nozzle 42 sends the floating oil F toward the branch pipe 22 through the inside of the suction nozzle 42. The floating oil F is sucked into the suction hole 22h provided on the peripheral wall of the branch pipe 22 through the internal space of the suction nozzle 42. The internal space of the suction nozzle 42 is flat in which the vertical dimension is smaller than the width direction dimension and the front-rear direction dimension. The height of the internal space of the suction nozzle 42 decreases from the opening located at the end of the suction nozzle 42 on the tip side (outside in the front-rear direction) toward the branch pipe 22 side (inside in the front-rear direction). The opening area of the cross section perpendicular to the front-rear direction of the suction nozzle 42 becomes smaller from the tip end (opening) of the suction nozzle 42 toward the branch pipe 22 side.

The suction nozzle 42 has a top wall portion 43, a side wall portion 44, and a bottom wall portion 45. That is, the nozzle portion 14 has a top wall portion 43, a side wall portion 44, and a bottom wall portion 45.
The top wall portion 43 is a substantially flat plate-shaped portion that connects to the outer end portion of the mounting portion 41 in the front-rear direction and extends in the front-rear direction from this end portion. The top wall portion 43 extends in a substantially horizontal direction. The end portion of the top wall portion 43 on the tip end side (outside in the front-rear direction) extends slightly upward toward the tip end side. The top wall portion 43 is arranged above the liquid level LS. The lower surface of the top wall portion 43 faces the liquid level LS from above with a gap from the liquid level LS. The vertical distance between the lower surface of the top wall portion 43 and the liquid level LS is, for example, 10 to 30 mm. This distance is preferably 15 to 25 mm.

A pair of side wall portions 44 are provided by connecting to both end portions of the top wall portion 43 in the width direction. The side wall portion 44 has a flat plate shape that extends in a direction perpendicular to the width direction. The side wall portion 44 extends downward from both ends in the width direction of the top wall portion 43. The lower end of the side wall 44 is immersed in the liquid D.

The bottom wall portion 45 is a flat plate-shaped portion that is bridged between the pair of side wall portions 44. Both ends of the bottom wall portion 45 in the width direction are connected to a pair of side wall portions 44. The bottom wall portion 45 is fixed to the pair of side wall portions 44. The inner end of the bottom wall portion 45 in the front-rear direction connects (contacts) with the peripheral wall of the branch pipe 22. The inner end of the bottom wall portion 45 in the front-rear direction may be arranged with a slight gap between it and the peripheral wall of the branch pipe 22. The inner end of the bottom wall portion 45 in the front-rear direction is located below the suction hole 22h of the branch pipe 22 and is arranged close to the suction hole 22h. That is, the inner end of the bottom wall portion 45 in the front-rear direction is located directly below the suction hole 22h and is arranged adjacent to the suction hole 22h.

The bottom wall portion 45 extends inclined downward as it is separated from the branch pipe 22 in the front-rear direction (that is, as it goes outward in the front-rear direction). Of the bottom wall portion 45, the inner (base end side) end in the front-rear direction is located above the liquid level LS. The outer (tip side) end of the bottom wall portion 45 in the front-rear direction is located below the liquid level LS. In the example of the present embodiment, the end portion on the tip end side of the bottom wall portion 45 is located at the end portion on the tip end side of the suction nozzle 42, and forms a part (lower end portion) of the opening portion of the suction nozzle 42. ..
That is, the nozzle portion 14 has a bottom wall portion 45, and the bottom wall portion 45 extends inclined downward from the suction pipe portion 12 in the horizontal direction (in the front-rear direction in the present embodiment), and the liquid is liquid. It is inserted into the surface LS. Since the bottom wall portion 45 is inserted obliquely with respect to the liquid level LS in this way, the floating oil F floating on the liquid level LS is in a state of riding on the bottom wall portion 45.

The angle at which the bottom wall portion 45 is inclined with respect to the liquid level LS (the inclination angle of the bottom wall portion 45 with respect to the horizontal direction) θ2 is, for example, 10 to 25 °. The angle θ2 is preferably 15 to 20 °.
The vertical distance between the bottom wall portion 45 and the top wall portion 43 gradually decreases from the opening located at the outer end of the suction nozzle 42 in the front-rear direction toward the inside in the front-rear direction.

In FIG. 9, the suction source 17 and the floating oil recovery tank 19 are installed outside the tank 2 in which the liquid D is stored. The suction source 17 is connected to the suction tube portion 12 via the tube 18. The suction source 17 sucks the floating oil F on the liquid level LS from the nozzle portion 14 through the suction pipe portion 12 and the tube 18. The floating oil F sucked from the nozzle portion 14 is collected in the floating oil recovery tank 19 through the suction pipe portion 12 and the tube 18.

Specifically, in the floating oil recovery device 10, when the suction source 17 such as a suction pump is operated, the internal space of the suction nozzle 42 becomes a negative pressure in the nozzle portion 14 connected to the suction source 17, and the suction nozzle 42 The liquid D (mainly the floating oil F, the same applies hereinafter) and the outside air in the vicinity of the liquid level LS are sucked from the opening of the liquid surface.
The floating oil recovery device 10 sucks the liquid D and the outside air into the suction nozzle 42 and introduces them into the branch pipe 22 (suction pipe portion 12). That is, the liquid D moves diagonally upward along the inclination of the bottom wall portion 45 in the suction nozzle 42 by the fluid suction force (air suction force) of the suction source 17, and enters the branch pipe 22 through the suction hole 22h. Be drawn in.

As shown in FIGS. 1 and 2, the liquid feed pipe 7 for the post-process is a pipe that feeds the liquid D in the tank 2 to the equipment (band tank) in the post-process. The liquid feed pipe 7 for the post-process sends the liquid D at the bottom of the tank 2 located in the first direction FD from the first partition plate 8 in the tank 2 to the equipment in the post-process.

According to the floating oil tank 1 of the present embodiment described above, the rising air bubbles discharged from the bubble generation nozzle 110 into the liquid D cause an upward flow in the liquid D, and the oil content in the liquid D is liquid together with the bubbles. Ascend to surface LS. As a result, the oil content in the liquid D and water or the like are promoted to be separated, and the floating oil F can be efficiently recovered by the floating oil recovery device 10. Further, even when the length of the tank 2 (tank length in the horizontal direction) is short, the floating oil F can be efficiently floated on the liquid level LS and recovered. Therefore, the floating oil tank 1 can be compactly configured and space can be saved. For example, the floating oil tank 1 can be easily installed even when the installation space of the facility is limited.

Further, in the present embodiment, the flow of the liquid D in the tank 2 can be guided by the guide means 4 arranged in the tank 2. Specifically, the guide means 4 can guide the flow of the liquid D rising together with the air bubbles to efficiently collect the floating oil F in the vicinity of the floating oil recovery device 10. Further, the guide means 4 suppresses the interference between the flow of the liquid D flowing into the tank 2 from the equipment in the previous process (downflow) and the flow of the liquid D rising with the bubbles in the tank 2 (upflow). it can.

Further, in the present embodiment, the first partition plate 8 is arranged on the downstream side of the bubble generating nozzle 110 and on the upstream side of the floating oil recovery device 10 in the first direction FD, and the bubble generating nozzle 110 and the floating oil recovery device 10 are arranged. Partition the space. Therefore, on the upstream side of the first partition plate 8 (on the right side in FIG. 1), the flow of the liquid D rising with the bubbles is guided by the first partition plate 8, and the floating oil F easily floats to the liquid surface LS quickly. Become. That is, the floating oil F is quickly reached the liquid level LS while suppressing the oil content in the liquid D from flowing in the first direction FD. The floating oil F that has floated on the liquid level LS flows between the upper end of the first partition plate 8 and the liquid level LS, that is, near the liquid level LS to the downstream side (left side in FIG. 1) of the first direction FD. It is collected in the vicinity of the floating oil recovery device 10 efficiently. As a result, the efficiency of recovering the floating oil F is further improved. Further, even when the length of the first direction FD of the tank 2 is short, the floating oil F can be efficiently floated on the liquid level LS and recovered, and the floating oil tank 1 can be configured more compactly.

Further, in the present embodiment, the mounting position of the first partition plate 8 can be adjusted in at least one of the downstream side, the upstream side, and the vertical direction of the first direction FD in the tank 2.
In this case, the recovery efficiency of the floating oil F can be improved by adjusting the mounting position of the first partition plate 8 in the tank 2 according to, for example, the degree of contamination of the liquid D (oil content).

Further, in the present embodiment, the first partition plate 8 is projected from the plate-shaped first main body portion 8a and the end portion of the first main body portion 8a of the second direction SD to the second direction SD so as to extendably project to the side wall. It has a first telescopic portion 8b that comes into contact with 2d.
In this case, by increasing or decreasing the amount of protrusion of the first telescopic portion 8b protruding from the first main body portion 8a in the second direction SD, the first telescopic portion 8b is pressed against the lateral wall 2d or separated from the lateral wall 2d. Can be done. That is, by expanding and contracting the first expansion / contraction portion 8b, the first partition plate 8 can be detachably fixed to the side wall 2d of the tank 2. According to this configuration, the mounting position of the first partition plate 8 can be finely adjusted in the tank 2, and the recovery efficiency of the floating oil F can be further improved. Since it is not necessary to embed anchor bolts or the like in the side wall 2d of the tank 2, the structure of the tank 2 can be simplified and the mounting position of the first partition plate 8 can be freely adjusted.

Further, in the present embodiment, the first partition plate 8 has a first sealing portion 8c that seals a gap between the end portion of the second direction SD of the first main body portion 8a and the lateral wall 2d.
In this case, the liquid D containing oil is suppressed by the first sealing portion 8c from flowing to the first direction FD through the gap between the end portion of the second direction SD of the first main body portion 8a and the lateral wall 2d. Therefore, the floating oil F is stably floated on the liquid level LS on the upstream side of the first partition plate 8, and the recovery efficiency of the floating oil F is improved.

Further, in the present embodiment, the second partition plate 9 is arranged on the upstream side of at least one of the plurality of bubble generating nozzles 110 and on the downstream side of the upstream vertical wall 2b in the first direction FD, and at least one bubble is generated. A partition is provided between the generation nozzle 110 and the upstream vertical wall 2b. Therefore, on the downstream side of the second partition plate 9, the flow of the liquid D rising together with the air bubbles is guided by the second partition plate 9, and the floating oil F easily floats to the liquid surface LS quickly. Further, on the upstream side of the second partition plate 9, the liquid D containing oil sent from the equipment in the previous process of the floating oil tank 1 flows into the tank 2 through between the second partition plate 9 and the upstream vertical wall 2b. Be done. That is, the second partition plate 9 guides the rise of the liquid D on the downstream side of the second partition plate 9, and guides the inflow (fall) of the liquid D on the upstream side of the second partition plate 9. The second partition plate 9 can prevent the flow of the liquid D flowing into the tank 2 from the equipment in the previous process and the flow of the liquid D rising with the bubbles in the tank 2 from interfering with each other. Thereby, the recovery efficiency of the floating oil F can be improved.

Further, in the present embodiment, the mounting position of the second partition plate 9 can be adjusted in at least one of the downstream side, the upstream side, and the vertical direction of the first direction FD in the tank 2.
In this case, for example, the mounting position of the second partition plate 9 in the tank 2 is adjusted according to the degree of contamination of the liquid D (oil content), the amount of inflow from the equipment in the previous process into the tank 2, and the like. , The recovery efficiency of the floating oil F can be improved.

Further, in the present embodiment, the second partition plate 9 is projected from the plate-shaped second main body portion 9a and the end of the second main body portion 9a of the second direction SD to the second direction SD so as to be expandable and contractable. It has a second telescopic portion 9b that comes into contact with 2d.
In this case, by increasing or decreasing the amount of protrusion of the second telescopic portion 9b protruding from the second main body portion 9a in the second direction SD, the second telescopic portion 9b is pressed against the lateral wall 2d or separated from the lateral wall 2d. Can be done. That is, by expanding and contracting the second telescopic portion 9b, the second partition plate 9 can be detachably fixed to the lateral wall 2d of the tank 2. According to this configuration, the mounting position of the second partition plate 9 can be finely adjusted in the tank 2, and the recovery efficiency of the floating oil F can be further improved. Since it is not necessary to embed anchor bolts or the like in the side wall 2d of the tank 2, the structure of the tank 2 can be simplified and the mounting position of the second partition plate 9 can be freely adjusted.

Further, in the present embodiment, the second partition plate 9 has a second sealing portion 9c that seals the gap between the end portion of the second direction SD of the second main body portion 9a and the side wall 2d.
In this case, the second sealing portion 9c suppresses the flow of the liquid D containing oil into the first direction FD through the gap between the end portion of the second direction SD of the second main body portion 9a and the lateral wall 2d. Therefore, the interference between the liquid D flowing on the upstream side of the second partition plate 9 and the liquid D flowing on the downstream side is further suppressed, and the recovery efficiency of the floating oil F is improved.

Further, in the present embodiment, the oil content in the liquid D can be efficiently floated on the liquid level LS by a plurality of bubble generation nozzles 110 provided at intervals in the first direction FD and the second direction SD. In particular, in the example of the present embodiment, since the plurality of bubble generating nozzles 110 are arranged in the first direction FD and the second direction SD at equal pitches, the above-mentioned effect becomes more remarkable.

Further, in the present embodiment, the bubble generation nozzle 110 discharges bubbles upward in the liquid D.
In this case, the bubbles are likely to rise smoothly to the liquid level LS, and the oil content in the liquid D can be efficiently floated by the liquid level LS.

Further, in the present embodiment, since the bubble generation nozzle 110 discharges microbubbles as bubbles into the liquid D, the oil content in the liquid D is efficiently separated from water or the like by the action (function) of the microbubbles. Ascend to the surface LS.

Further, in the present embodiment, as shown in FIG. 6, the micro-bubble generation flow path portion 132 of the bubble generation nozzle 110 has a diameter-expanded flow path portion 132a and a diameter-reduced flow path portion 132b. Therefore, the liquid D in the bubble generation nozzle 110 flows through the microbubble generation flow path portion 132 from the diameter expansion flow path portion 132a to the diameter reduction flow path portion 132b, so that the pressure of the liquid D in the flow path 115 changes. Microbubbles are generated in the liquid D due to the action of centrifugal force on the liquid D.

According to the bubble generation nozzle 110 having the above configuration, it is possible to generate microbubbles while simplifying the structure without forming the flow path in a spiral shape as in the conventional structure described in Japanese Patent No. 6312768, for example. .. Therefore, the bubble generation nozzle 110 can be easily manufactured. Further, in the bubble generation nozzle 110 having the above configuration, it is easy to keep the total length in the axial direction particularly small as compared with the conventional structure. Therefore, the outer shape of the bubble generating nozzle 110 can be suppressed to be compact.

Further, in the present embodiment, the microbubble generation flow path portion 132 is an annular shape extending in the circumferential direction around the central axis A.
In this case, the structure of the micro-bubble generation flow path portion 132 can be further simplified, and the production of the bubble generation nozzle 110 becomes easier.

Further, in the present embodiment, the enlarged diameter flow path portion 132a is formed by the enlarged diameter inner peripheral surface portion 120 and the expanded outer peripheral surface portion 124, and the reduced diameter flow path portion 132b is formed by the reduced diameter inner peripheral surface portion 122 and the reduced diameter outer peripheral surface portion. Formed by 125 and.
In this case, the liquid D in the bubble generation nozzle 110 flows from the enlarged flow path portion 132a to the reduced diameter flow path portion 132b, so that the liquid D in the flow path 115 is allowed to stably act on the pressure change and the centrifugal force. And microbubbles are generated more stably in the liquid D.

Further, in the present embodiment, the diameter-expanded inner peripheral surface portion 120 has a first diameter-expanded concave-convex portion 121 in which the concave-convex shape is repeated along the axial direction, and the diameter-expanded outer peripheral surface portion 124 has a concave-convex shape along the axial direction. It has a second enlarged uneven portion 126 that is repeated.
That is, since the enlarged inner peripheral surface portion 120 and the enlarged outer peripheral surface portion 124 forming the enlarged diameter flow path portion 132a each have a portion in which the uneven shape is repeated in the axial direction, the liquid D flowing inside the enlarged diameter flow path portion 132a In addition, changes in pressure and centrifugal force can be made easier to act. Further, the cross-sectional shape and cross-sectional area of the enlarged diameter flow path portion 132a change at each position in the axial direction. Therefore, microbubbles are more likely to be stably generated in the liquid D flowing through the diameter-expanded flow path portion 132a.

Further, in the present embodiment, the convex portion 121a of the first enlarged diameter concavo-convex portion 121 and the convex portion 126a of the second enlarged diameter concavo-convex portion 126 are arranged so as to face each other, and the concave portion 121b of the first enlarged diameter concavo-convex portion 121 And the recess 126b of the second diameter-expanded uneven portion 126 are arranged so as to face each other.
In this case, the cross-sectional shape and cross-sectional area of the enlarged diameter flow path portion 132a change more greatly at each position in the axial direction. Therefore, microbubbles are more stably generated in the liquid D flowing through the diameter-expanded flow path portion 132a.

Further, in the present embodiment, the reduced-diameter inner peripheral surface portion 122 has a first reduced-diameter concavo-convex portion 123 in which the concave-convex shape is repeated along the axial direction, and the reduced-diameter outer peripheral surface portion 125 has a concave-convex shape along the axial direction. It has a second reduced-diameter uneven portion 127 that is repeated.
That is, since the reduced-diameter inner peripheral surface portion 122 and the reduced-diameter outer peripheral surface portion 125 forming the reduced-diameter flow path portion 132b each have a portion in which the uneven shape is repeated in the axial direction, the liquid D flowing inside the reduced-diameter flow path portion 132b. In addition, changes in pressure and centrifugal force can be made easier to act. Further, the cross-sectional shape and cross-sectional area of the reduced diameter flow path portion 132b change at each position in the axial direction. Therefore, microbubbles are more likely to be stably generated in the liquid D flowing through the reduced diameter flow path portion 132b.

Further, in the present embodiment, the convex portion 123a of the first reduced-diameter concavo-convex portion 123 and the convex portion 127a of the second reduced-diameter concavo-convex portion 127 are arranged so as to face each other, and the concave portion 123b of the first reduced-diameter concavo-convex portion 123. And the recess 127b of the second diameter-reduced uneven portion 127 are arranged so as to face each other.
In this case, the cross-sectional shape and cross-sectional area of the reduced diameter flow path portion 132b change more greatly at each position in the axial direction. Therefore, microbubbles are more stably generated in the liquid D flowing through the reduced diameter flow path portion 132b.

Further, in the present embodiment, the plurality of connecting flow path portions 130a of the inflow side flow path portion 130 are arranged at equal pitches in the circumferential direction around the central axis A.
In this case, the liquid D is evenly dispersed in the circumferential direction and flows into the microbubble generating flow path portion 132 from the plurality of connection flow path portions 130a of the inflow side flow path portion 130. Therefore, the microbubbles can be uniformly generated in the circumferential direction in the liquid D flowing through the microbubble generation flow path portion 132.

Further, in the present embodiment, the plurality of ejection flow path portions 131a of the outflow side flow path portion 131 are arranged at equal pitches in the circumferential direction around the central axis A.
In this case, the liquid D is evenly dispersed and flows into the plurality of ejection flow paths 131a of the outflow side flow path 131 from the micro bubble generation flow path 132. Therefore, the liquid D containing the microbubbles can be uniformly ejected from the plurality of ejection flow paths 131a in the circumferential direction.

Further, in the present embodiment, as shown in FIG. 10, the bottom wall portion 45 of the nozzle portion 14 of the floating oil recovery device 10 extends incline toward the lower side as it is separated from the suction pipe portion 12 in the horizontal direction. It is inserted diagonally with respect to the liquid level LS. Therefore, when the floating oil F and the liquid D such as water that have run on the bottom wall 45 are sucked diagonally upward along the inclination of the bottom wall 45, the water or the like on the bottom wall 45 is sucked. , The inclination of the bottom wall portion 45 makes it easier to return to the liquid level LS. Further, the floating oil F on the bottom wall portion 45 can be easily pulled up diagonally upward along the inclination of the bottom wall portion 45. As a result, the recovery amount (ratio) of water or the like can be reduced, and the recovery efficiency of the floating oil F can be improved.

Specifically, the floating oil F has a lower specific gravity than water or the like and is located above the water or the like, so that it can easily ride on the bottom wall portion 45. Further, when the floating oil F rides on the bottom wall portion 45, it is difficult for the floating oil F to flow diagonally downward due to gravity (it is easier to stay on the bottom wall portion 45 than water or the like). Then, the floating oil F is easily pulled up diagonally upward on the bottom wall portion 45 by the fluid suction force of the suction source 17. Therefore, the amount (recovered amount) of the floating oil F sucked into the branch pipe 22 increases.
On the other hand, water or the like has a higher specific gravity than the floating oil F and is located below the floating oil F, so that it is difficult to ride on the bottom wall portion 45. In addition, even if water or the like rides on the bottom wall portion 45, it tends to flow diagonally downward due to gravity (it is difficult to stay on the bottom wall portion 45). Then, depending on the fluid suction force of the suction source 17, it is difficult for water or the like to be pulled up diagonally upward on the bottom wall portion 45. Therefore, the amount of water or the like sucked into the branch pipe 22 (recovered amount) is reduced.
From the above, according to the present embodiment, the recovery efficiency of the floating oil F can be improved as compared with the conventional case.

Further, in the present embodiment, since the angle θ1 is 35 to 70 °, the following effects can be obtained.
Since the angle θ1 is 35 ° or more, the distance between the inner end (base end) of the bottom wall portion 45 in the front-rear direction and the suction hole 22h can be reduced. Therefore, a strong fluid suction force can be applied to the floating oil F on the bottom wall portion 45 from the suction hole 22h.
Since the angle θ1 is 70 ° or less, it is possible to prevent the suction hole 22h from getting too close to the liquid level LS. Therefore, it is possible to prevent water or the like from being directly sucked into the branch pipe 22 from the suction hole 22h without passing over the bottom wall portion 45.
In order to make the above-mentioned action and effect more remarkable, the angle θ1 is preferably 45 to 60 °.

Further, in the present embodiment, since the angle θ2 is 10 to 25 °, the following effects can be obtained.
Since the angle θ2 is 10 ° or more, water or the like in the liquid D tends to flow diagonally downward from above the bottom wall portion 45. That is, the action of returning water or the like to the liquid level LS from above the bottom wall portion 45 can be stably obtained.
Since the angle θ2 is 25 ° or less, the floating oil F can be easily pulled diagonally upward from above the bottom wall portion 45 by the fluid suction force of the suction source 17. That is, the action of sucking and recovering the floating oil F from above the bottom wall portion 45 can be stably obtained.
In order to make the above-mentioned action and effect more remarkable, the angle θ2 is preferably 15 to 20 °.

Further, in the present embodiment, as shown in FIG. 9, the float support portion 32 of the float portion 13 is fixed to the portion (main pipe 21) extending in the vertical direction of the suction pipe portion 12 so that the position in the vertical direction can be adjusted. ing.
As a result, the relative position of the float portion 13 and the suction pipe portion 12 in the vertical direction can be adjusted, and the vertical position of the nozzle portion 14 with respect to the liquid level LS can be adjusted. Therefore, the position of the bottom wall portion 45 of the nozzle portion 14 in the vertical direction with respect to the liquid level LS can be maintained satisfactorily, making it difficult to suck water or the like from the nozzle portion 14 and making it easier to suck the floating oil F to recover the floating oil F. Efficiency can be stably improved.

Next, a modification (first to third modification) of the levitation oil recovery device 10 included in the levitation oil tank 1 of the first embodiment will be described.

<First modification>
FIG. 11 is a side view showing a first modification of the nozzle portion 14 (suction nozzle 42) of the floating oil recovery device 10.
In this first modification, the suction nozzle 42 has a bottom wall portion 46 in addition to the top wall portion 43, the side wall portion 44, and the bottom wall portion 45. That is, the nozzle portion 14 has a plurality of bottom wall portions 45, 46. The plurality of bottom wall portions 45, 46 are arranged next to each other with a gap in the direction away from the suction pipe portion 12 in the horizontal direction (the front-rear direction in this modification).

In the illustrated example, the suction nozzle 42 has two bottom wall portions 45, 46.
Of the two bottom wall portions 45 and 46, the bottom wall portion 45 that connects (contacts) with the peripheral wall of the branch pipe 22 is the first bottom wall portion 45. The outer (tip side) end of the first bottom wall portion 45 in the front-rear direction is arranged inside (base end side) in the front-rear direction with respect to the outer end of the suction nozzle 42 in the front-rear direction. The configuration of the first bottom wall portion 45 other than the above is the same as that of the bottom wall portion 45 of the first embodiment described above.

Of the two bottom wall portions 45, 46, the bottom wall portion 46 located outside the first bottom wall portion 45 in the front-rear direction is the second bottom wall portion 46. The second bottom wall portion 46 is a flat plate-shaped portion that is bridged between the pair of side wall portions 44. Both ends of the second bottom wall portion 46 in the width direction are connected to the pair of side wall portions 44. The inner end portion of the second bottom wall portion 46 in the front-rear direction is arranged apart from the peripheral wall of the branch pipe 22 to the outside in the front-rear direction. The inner end of the second bottom wall 46 in the front-rear direction is located above the outer end of the first bottom wall 45 in the front-rear direction. When viewed from the vertical direction, the inner end portion of the second bottom wall portion 46 in the front-rear direction and the outer end portion of the first bottom wall portion 45 in the front-rear direction are arranged so as to overlap each other.

The second bottom wall portion 46 extends inclined downward as it goes outward in the front-rear direction (as it moves horizontally away from the suction pipe portion 12), and is inserted into the liquid level LS. Of the second bottom wall portion 46, the inner end portion in the front-rear direction is located above the liquid level LS. The outer end of the second bottom wall portion 46 in the front-rear direction is located below the liquid level LS. In this modification, the outer end (tip side) of the second bottom wall portion 46 in the front-rear direction is located at the outer end of the suction nozzle 42 in the front-rear direction.

The vertical distance between the second bottom wall portion 46 and the top wall portion 43 gradually decreases from the outer end portion of the suction nozzle 42 in the front-rear direction toward the inside in the front-rear direction. Since the second bottom wall portion 46 is inserted obliquely with respect to the liquid level LS, the floating oil F floating on the liquid level LS is in a state of riding on the second bottom wall portion 46.

The angle θ3 at which the second bottom wall portion 46 is inclined with respect to the liquid level LS (the angle at which the second bottom wall portion 46 is inclined with respect to the horizontal direction) θ3 is, for example, 10 to 25 °. The angle θ3 is preferably 15 to 20 °. In the illustrated example, when viewed from the central axis C direction, the two bottom wall portions 45, 46 of each suction nozzle 42 extend in parallel with each other, and the angle θ2 and the angle θ3 are the same as each other.

According to the first modification described above, the same effects as those of the above-described first embodiment can be obtained. Further, since the nozzle portion 14 has a plurality of bottom wall portions 45, 46, the separation of the floating oil F and water or the like is further promoted on the bottom wall portions 45, 46, and the recovery efficiency of the floating oil F is improved. Can be done. That is, when the floating oil F, water, or the like is sucked toward the branch pipe 22 (suction pipe portion 12) while overcoming the plurality of bottom wall portions 45, 46, between the plurality of bottom wall portions 45, 46. In, water and the like are returned to the liquid level LS. That is, the floating oil F gets over the plurality of bottom wall portions 45 and 46 and is sucked into the branch pipe 22, but water and the like get over the plurality of bottom wall portions 45 and 46 and are sucked into the bottom wall portions 45 and 46. It becomes easy to return to the liquid level LS between each other. Therefore, the recovery efficiency of the floating oil F is further improved.

Specifically, the liquid D sucked by the suction nozzle 42 is allowed to get over two slopes (bottom wall portions 45 and 46) before reaching the branch pipe 22. At this time, the floating oil F having a small specific gravity easily reaches the branch pipe 22, but the water having a large specific gravity cannot get over the two slopes (bottom wall portions 45 and 46) and the liquid level LS. It becomes easy to be returned to. That is, water and the like are less likely to be introduced into the branch pipe 22, and the amount of water recovered is reduced.
Therefore, the separation of the floating oil F and water or the like is further promoted, and the recovery efficiency of the floating oil F is enhanced.

Further, since the angle θ3 is 10 to 25 °, the following effects can be obtained.
Since the angle θ3 is 10 ° or more, water or the like easily flows diagonally downward from above the second bottom wall portion 46. That is, the action of returning water or the like to the liquid level LS from above the second bottom wall portion 46 can be stably obtained.
Since the angle θ3 is 25 ° or less, the floating oil F can be easily pulled diagonally upward from above the second bottom wall portion 46 by the fluid suction force of the suction source 17. That is, the action of sucking and recovering the floating oil F from above the second bottom wall portion 46 can be stably obtained.
In order to make the above-mentioned action and effect more remarkable, the angle θ3 is preferably 15 to 20 °.

<Second modification>
FIG. 12 is a side view showing a second modification of the nozzle portion 14 (suction nozzle 42) of the floating oil recovery device 10.
In this second modification, the suction nozzle 42 has a bottom wall member 47 in addition to the top wall portion 43, the side wall portion 44, and the bottom wall portion 45. The bottom wall member 47 has a bottom wall portion 48 and a pair of ear portions 49. That is, the suction nozzle 42 (nozzle portion 14) has a plurality of bottom wall portions 45, 48. The plurality of bottom wall portions 45, 48 are arranged next to each other with a gap in the direction away from the suction pipe portion 12 in the horizontal direction (the front-rear direction in this modification).

In the illustrated example, the suction nozzle 42 has two bottom wall portions 45, 48.
Of the two bottom wall portions 45, 48, the bottom wall portion (first bottom wall portion) 45 that connects (contacts) with the peripheral wall of the branch pipe 22 is the same as the bottom wall portion 45 of the first embodiment described above. It has the structure of.
Of the two bottom wall portions 45, 48, the bottom wall portion (second bottom wall portion) 48 arranged outside the bottom wall portion 45 in the front-rear direction constitutes a part of the bottom wall member 47.

The bottom wall member 47 is a plate-shaped member and is arranged on the first bottom wall portion 45. The bottom wall member 47 is supported by the nozzle portion 14 so as to be movable in a direction in which the bottom wall portions 45 and 48 are inclined with respect to the liquid level LS. Specifically, the bottom wall member 47 is in a direction in which the bottom wall portions 45, 48 are inclined with respect to the top wall portion 43, the side wall portion 44, and the bottom wall portion 45 of the suction nozzle 42 when viewed from the central axis C direction (bottom). It can be slid along the direction in which the wall portions 45 and 48 extend). Therefore, the bottom wall portion 48 of the bottom wall member 47 is also supported by the nozzle portion 14 so as to be movable in the direction in which the bottom wall portions 45 and 48 are inclined with respect to the liquid level LS. That is, the bottom wall portion 48 is directed along the direction in which the bottom wall portions 45, 48 are inclined with respect to the top wall portion 43, the side wall portion 44, and the bottom wall portion 45 of the suction nozzle 42 when viewed from the central axis C direction. The slide can be moved.

The bottom wall portion (second bottom wall portion) 48 included in the bottom wall member 47 has a flat plate shape and extends substantially parallel to the first bottom wall portion 45. The second bottom wall portion 48 faces the first bottom wall portion 45 with a gap. The second bottom wall portion 48 faces the first bottom wall portion 45 from the upper side and the outer side in the front-rear direction.

The inner end portion of the second bottom wall portion 48 in the front-rear direction is arranged apart from the peripheral wall of the branch pipe 22 to the outside in the front-rear direction. The inner end of the second bottom wall portion 48 in the front-rear direction is located above the outer end portion of the first bottom wall portion 45 in the front-rear direction. In the illustrated example, the inner end of the second bottom wall 48 in the front-rear direction is located inside the front-back direction of the outer end of the first bottom wall 45 in the front-rear direction. When viewed from the vertical direction, the inner portion of the second bottom wall portion 48 along the front-rear direction and the outer portion of the first bottom wall portion 45 along the front-rear direction are arranged so as to overlap each other.

The second bottom wall portion 48 extends so as to be outward in the front-rear direction (distance from the suction pipe portion 12 in the horizontal direction), and is inserted into the liquid level LS. Of the second bottom wall portion 48, the inner end portion in the front-rear direction is located above the liquid level LS. Of the second bottom wall portion 48, the outer end portion in the front-rear direction is located below the liquid level LS. In this modification, the end portion of the second bottom wall portion 48 in the front-rear direction (tip side) is the outside of the suction nozzle 42 (top wall portion 43, side wall portion 44 and bottom wall portion 45) in the front-rear direction. It is arranged so as to project outward in the front-rear direction from the end of the.

The vertical distance between the second bottom wall portion 48 and the top wall portion 43 decreases inward in the front-rear direction. Since the second bottom wall portion 48 is inserted obliquely with respect to the liquid level LS, the floating oil F floating on the liquid level LS is in a state of riding on the second bottom wall portion 48.

The angle at which the second bottom wall portion 48 is inclined with respect to the liquid level LS (the inclination angle of the second bottom wall portion 48 with respect to the horizontal direction) θ4 is, for example, 10 to 25 °. The angle θ4 is preferably 15 to 20 °. In the illustrated example, when viewed from the central axis C direction, the two bottom wall portions 45, 48 of each suction nozzle 42 extend in parallel with each other, and the angle θ2 and the angle θ4 are the same as each other.

The pair of ear portions 49 included in the bottom wall member 47 are connected to both ends in the width direction of the second bottom wall portion 48. The selvage portion 49 has a flat plate shape that extends in a direction perpendicular to the width direction. The selvage portion 49 extends downward from both ends in the width direction of the second bottom wall portion 48. The lower end of the ear portion 49 comes into contact with the upper surface of the first bottom wall portion 45. The selvage portion 49 extends along the direction in which the bottom wall portions 45 and 48 are inclined with respect to the liquid level LS.

The selvage portion 49 has a plurality of position adjusting holes 49a arranged along the direction in which the bottom wall portions 45 and 48 are inclined with respect to the liquid level LS. The position adjusting hole 49a penetrates the selvage portion 49 in the width direction (plate thickness direction). The position adjusting hole 49a has a female screw portion on the inner peripheral surface of the position adjusting hole 49a. Of the plurality of position adjusting holes 49a, a screw member (not shown) that is passed through the through hole 44a of the side wall portion 44 is screwed into the predetermined (one) position adjusting hole 49a. As a result, the bottom wall member 47 is fixed to the suction nozzle 42.

According to the second modification described above, the same effect as that of the first embodiment described above can be obtained. Further, for example, the bottom wall portion 48 is moved together with the bottom wall member 47 in the direction in which the bottom wall portions 45, 48 are inclined according to the state and amount of the floating oil F floating on the liquid level LS, thereby causing the liquid level LS. The position (vertical direction) of the second bottom wall portion 48 with respect to the relative can be adjusted. As a result, the recovery efficiency of the floating oil F can be improved.
Further, since the angle θ4 is 10 to 25 °, the same effect as the above-mentioned angle θ3 can be obtained. In order to make this effect more remarkable, the angle θ4 is preferably 15 to 20 °.

<Third modification example>
FIG. 13 is a side view showing a third modified example of the nozzle portion 14 (suction nozzle 42) of the floating oil recovery device 10. 14 (a) to 14 (c) show the slide wall portion 52 of the bottom wall portion 50 of FIG.
In this third modification, the suction nozzle 42 has a top wall portion 43, a side wall portion 44, and a bottom wall portion 50. The bottom wall portion 50 extends incline toward the lower side as it separates from the branch pipe 22 (suction pipe portion 12) in the horizontal direction (front-back direction in this modification), and is inserted into the liquid level LS. The bottom wall portion 50 has a support wall portion 51 and a slide wall portion 52.

The support wall portion 51 is a flat plate-shaped portion that is bridged between the pair of side wall portions 44. Both ends of the support wall portion 51 in the width direction are connected to a pair of side wall portions 44. The support wall portion 51 is fixed to the pair of side wall portions 44. The inner end of the support wall portion 51 in the front-rear direction connects (contacts) with the peripheral wall of the branch pipe 22. The inner end of the support wall portion 51 in the front-rear direction may be arranged with a slight gap between it and the peripheral wall of the branch pipe 22. The inner end of the support wall portion 51 in the front-rear direction is located below the suction hole 22h of the branch pipe 22 and is arranged close to the suction hole 22h. That is, the inner end portion of the support wall portion 51 in the front-rear direction is located directly below the suction hole 22h and is arranged adjacent to the suction hole 22h.

The support wall portion 51 extends inclined downward as it is separated from the branch pipe 22 in the front-rear direction (that is, as it goes outward in the front-rear direction). The inner (base end side) end of the support wall portion 51 in the front-rear direction is located above the liquid level LS. Of the support wall portions 51, the outer (tip side) end in the front-rear direction is located below the liquid level LS.
That is, the support wall portion 51 extends incline toward the lower side as it is separated from the suction pipe portion 12 in the horizontal direction (in the front-rear direction in this modification), and is inserted into the liquid level LS.

The slide wall portion 52 has a plate shape. In this modification, the slide wall portion 52 has a quadrangular plate shape. The plate surfaces (upper surface 52a and lower surface 52b) of the slide wall portion 52 face in the vertical direction. The slide wall portion 52 is arranged on the support wall portion 51. The lower surface 52b of the slide wall 52 comes into contact with the upper surface of the support wall 51. The slide wall portion 52 is placed on the upper surface of the support wall portion 51 and can be slidably moved with respect to the support wall portion 51. The slide wall portion 52 is supported by the suction nozzle 42 on the support wall portion 51 so as to be movable in the direction in which the bottom wall portion 50 (support wall portion 51) is inclined with respect to the liquid level LS. That is, the bottom wall portion 50 is supported by the nozzle portion 14 so as to be movable in the direction in which the bottom wall portion 50 is inclined with respect to the liquid level LS.

The upper surface 52a of the slide wall portion 52 has a portion parallel to the lower surface 52b of the slide wall portion 52 and a portion inclined with respect to the lower surface 52b.
Of the upper surface 52a of the slide wall portion 52, the portion parallel to the lower surface 52b is located inside the slide wall portion 52 in the front-rear direction. Therefore, the inner portion of the slide wall portion 52 in the front-rear direction has a constant plate thickness along the front-rear direction.
Of the upper surface 52a of the slide wall portion 52, the portion inclined with respect to the lower surface 52b is located on the outer portion of the slide wall portion 52 in the front-rear direction. The portion of the upper surface 52a that is inclined with respect to the lower surface 52b becomes smaller in distance from the lower surface 52b as it goes outward in the front-rear direction. Therefore, the thickness of the outer portion of the slide wall portion 52 in the front-rear direction becomes smaller as it goes outward in the front-rear direction.

The slide wall portion 52 has a liquid return groove 53 on the upper surface 52a of the slide wall portion 52. That is, the bottom wall portion 50 has a liquid return groove 53 on the upper surface 52a of the bottom wall portion 50. The liquid return groove 53 is recessed downward on the upper surface 52a and extends in the front-rear direction. Specifically, the liquid return groove 53 extends along the direction in which the bottom wall portion 50 is inclined with respect to the liquid level LS on the upper surface 52a. A plurality of liquid return grooves 53 are arranged on the upper surface 52a at intervals in the width direction.

In the illustrated example, the liquid return groove 53 does not open to the inward facing end face and the outward facing end face of the slide wall portion 52 in the front-rear direction. The liquid return groove 53 is arranged in an intermediate portion located between the inner end portion and the outer end portion in the front-rear direction of the slide wall portion 52. The liquid return groove 53 may be opened in at least one of the end face facing inward in the front-rear direction and the end face facing outward in the front-rear direction of the slide wall portion 52.

In the portion of the upper surface 52a of the slide wall portion 52 parallel to the lower surface 52b, the groove depth of the liquid return groove 53 is constant along the front-rear direction. In the portion of the upper surface 52a of the slide wall portion 52 that is inclined with respect to the lower surface 52b, the groove depth of the liquid return groove 53 becomes shallower toward the outside in the front-rear direction.

The side surface 52c of the slide wall portion 52 faces in the width direction. A pair of side surfaces 52c are provided on the slide wall portion 52. The pair of side surfaces 52c face both sides in the width direction of the slide wall portion 52. The side surface 52c faces the side wall 44 of the suction nozzle 42. The side surface 52c comes into contact with the side wall 44.

The slide wall portion 52 has a screw hole 52d on the side surface 52c. The screw hole 52d opens in the side surface 52c and is recessed in the width direction. A plurality of screw holes 52d are provided on the side surface 52c. The plurality of screw holes 52d are arranged parallel to the lower surface 52b on the side surface 52c. The plurality of screw holes 52d are arranged on the side surface 52c along the direction in which the bottom wall portion 50 is inclined with respect to the liquid level LS. The screw hole 52d has a female screw portion on the inner peripheral surface of the screw hole 52d. Of the plurality of screw holes 52d, a screw member (not shown) that is passed through the through hole 44a of the side wall portion 44 is screwed into the predetermined (one) screw hole 52d. As a result, the slide wall portion 52 is fixed to the suction nozzle 42.

According to the third modification described above, the same effect as that of the first embodiment described above can be obtained. Further, for example, the bottom wall portion 50 (slide wall portion 52) is moved in the direction in which the bottom wall portion 50 is inclined according to the state and amount of the floating oil F floating on the liquid level LS, so that the liquid level LS is relative to the bottom wall portion 50. The vertical position of the bottom wall portion 50 (slide wall portion 52) can be adjusted. As a result, the recovery efficiency of the floating oil F can be improved.
Further, of the floating oil F and the liquid D such as water that have run on the slide wall portion 52, water or the like flows into the liquid return groove 53 and is returned to the liquid level LS through the liquid return groove 53. Therefore, the recovery efficiency of the floating oil F can be further improved.

Further, in the present embodiment, as shown in FIG. 1, the pump unit 5 pumps the liquid D from the bottom of the tank 2, pressurizes it, and sends it to the bubble generation nozzle 110.
In this case, the liquid D is pumped out by the pump unit 5 from the bottom of the tank 2 away from the liquid level LS on which the floating oil F floats, pressurized and sent to the bubble generation nozzle 110, and the liquid D flows out into the tank 2 together with the bubbles. Therefore, the liquid D having a low oil content can be effectively used for separating the floating oil F. As a result, the running cost of the floating oil tank 1 can be reduced. Further, since the liquid D pressurized by the pump unit 5 is sent to the bubble generation nozzle 110, oil and dust in the bubble generation nozzle 110 are ejected together with the liquid D to the outside of the nozzle, and clogging inside the nozzle is suppressed. Nozzle. Therefore, the function of the bubble generating nozzle 110 is maintained well, and the frequency of maintenance and member replacement of the bubble generating nozzle 110 can be suppressed.

<Second Embodiment>
The floating oil recovery device 20 included in the floating oil tank 1 of the second embodiment of the present invention will be described with reference to FIGS. 15 to 17.
In the second embodiment, the same parts as the components in the first embodiment are designated by the same reference numerals, the description thereof will be omitted, and the differences will be mainly described.

Of the configurations provided in the floating oil tank 1 of the present embodiment, the tank 2, the liquid feed pipe for bubbles 3, the bubble generating nozzle 110, the pumping pipe 6, the pump unit 5, the guide means 4 and the rear, other than the floating oil recovery device 20. The liquid feed pipe 7 for the process is the same as each configuration described in the first embodiment.

The floating oil recovery device 20 is floated on the liquid level LS of the liquid D in the tank 2 to recover the floating oil F.
As shown in FIGS. 15 to 17, the floating oil recovery device 20 includes a suction pipe portion 72, a float portion 13, and a nozzle portion 74. Although not particularly shown, the floating oil recovery device 20 includes a tube 18, a suction source 17, and a floating oil recovery tank 19.

The suction pipe portion 72 is connected to the nozzle portion 74 that sucks the floating oil F. The suction tube portion 72 is provided between the nozzle portion 74 and the suction source 17. The suction pipe portion 72 forms a part of the flow path (pipeline) of the suction pipe that sucks the floating oil F. The suction pipe portion 72 is a portion of the suction pipe (whole) located near the liquid level LS. The float portion 13 supports the suction pipe portion 72 and the nozzle portion 74. The nozzle portion 74 is arranged on the liquid level LS. The float portion 13 moves up and down according to (fluctuation) of the water level of the liquid D, and the nozzle portion 74 and the suction pipe portion 72 are arranged near the liquid level LS.

The suction pipe portion 72 has a portion (main pipe 81) extending in the vertical direction from above the tank 2 toward the liquid level LS. In the example of this embodiment, the suction pipe portion 72 is a pipe (circular pipe, round pipe) having a circular cross section. The suction tube portion 72 is made of a synthetic resin such as ultra high molecular weight polyethylene (UHMWPE) or the like. A tube 18 is connected to the upper end of the suction tube portion 72. The suction pipe portion 72 is connected to the suction source 17 and the floating oil recovery tank 19 via the tube 18 (see FIG. 9).

The suction pipe portion 72 has a main pipe 81.
The main pipe 81 extends in the vertical direction. That is, the main pipe 81 is a portion of the suction pipe portion 72 that extends in the vertical direction. The lower end of the main pipe 81 is located below the liquid level LS. The lower end of the main pipe 81 is arranged near the liquid level LS. The portion other than the lower end portion of the main pipe 81 (the portion located above the lower end portion) is arranged above the liquid level LS.
In the following description, the direction orthogonal to the axis O, which is the central axis of the suction pipe portion 72 (main pipe 81), is referred to as a radial direction. Of the radial directions, the direction approaching the axis O is called the inner side in the radial direction, and the direction away from the axis O is called the outer side in the radial direction. Further, the direction of orbiting around the axis O is called the circumferential direction.

The main pipe 81 has a suction hole 81h in the peripheral wall of the main pipe 81. The suction hole 81h is a through hole that penetrates the peripheral wall of the main pipe 81, and is oval-shaped in the example of the present embodiment. The suction hole 81h is arranged at the lower end of the main pipe 81 and extends in the vertical direction. A plurality of suction holes 81h are provided at the lower end of the peripheral wall of the main pipe 81 at intervals in the circumferential direction (four in the example of the present embodiment). The plurality of suction holes 81h are opened on the outer peripheral surface of the main pipe 81 at equal intervals in the circumferential direction.

One nozzle portion 74 is provided at the lower end portion of the suction pipe portion 72. The nozzle portion 74 has a substantially disk shape centered on the axis O of the suction pipe portion 72. In the present embodiment, the nozzle portion 74 is made of a synthetic resin such as ultra high molecular weight polyethylene (UHMWPE) or the like.

The nozzle portion 74 is floated (arranged) on the liquid level LS of the liquid D by the float portion 13 and sucks the floating oil F. The nozzle portion 74 of the present embodiment has an annular opening that opens all around the axis O on the outer circumference of the nozzle portion 74. The opening of the nozzle portion 74 opens in the radial direction on the outer peripheral surface of the nozzle portion 74. The lower end of the opening of the nozzle portion 74 is immersed under the liquid level LS, and the portion other than the lower end is exposed on the liquid level LS. That is, the nozzle portion 74 has a portion located below the liquid level LS and a portion located above the liquid level LS. The floating oil F on the liquid level LS and the liquid D such as water can enter the nozzle portion 74 through the opening.

The nozzle portion 74 has a top wall member 75 and a bottom wall member 76.
The top wall member 75 has a substantially circular ring plate shape centered on the axis O. The top wall member 75 is arranged above the liquid level LS. The top wall member 75 has a through hole that penetrates the top wall member 75 in the vertical direction. The main pipe 81 is inserted into the through hole. The top wall member 75 is fixed to the peripheral wall of the main pipe 81.

The lower surface of the top wall member 75 is a flat surface perpendicular to the axis O. The lower surface of the top wall member 75 faces the liquid level LS with a gap. The vertical distance between the lower surface of the top wall member 75 and the liquid level LS is, for example, 10 to 25 mm. This distance is preferably 15 to 20 mm. Further, the vertical distance between the lower surface of the top wall member 75 and the upper end of the bottom wall member 76 (the upper end of the bottom wall portion 77 described later) is, for example, 3 to 12 mm. This distance is preferably 6-9 mm.
In the illustrated example, the upper surface of the top wall member 75 has a tapered shape that inclines downward as it goes outward in the radial direction.

The bottom wall member 76 has a substantially disk shape centered on the axis O. The bottom wall member 76 is fixed to the lower end of the main pipe 81. The bottom wall member 76 is arranged downward (with a gap) from the top wall member 75. The upper end portion of the bottom wall member 76 is arranged above the liquid level LS, and the portion other than the upper end portion (the portion located below the upper end portion) is arranged below the liquid level LS. The space between the top wall member 75 and the bottom wall member 76 becomes the internal space of the nozzle portion 74.

The bottom wall member 76 has a bottom wall portion 77, an oil holding hole 78, and a pipe fixing hole 79.
The bottom wall portion 77 is provided on the upper surface of the bottom wall member 76. The bottom wall portion 77 has a conical shape extending around the axis O of the suction pipe portion 72. The bottom wall portion 77 extends obliquely downward from the suction pipe portion 72 in the horizontal direction (diameter direction in the present embodiment), and is inserted into the liquid level LS. The inner end of the bottom wall portion 77 in the radial direction is located above the liquid level LS. The radial inner end of the bottom wall portion 77 is arranged close to the suction hole 81h of the main pipe 81. The outer end of the bottom wall portion 77 in the radial direction is located below the liquid level LS. The radial outer end of the bottom wall 77 is connected to the upper end of the outer peripheral surface of the bottom wall member 76.
In this way, since the bottom wall portion 77 is inserted obliquely with respect to the liquid surface LS, the floating oil F floating on the liquid surface LS is in a state of riding on the bottom wall portion 77.

The angle at which the bottom wall portion 77 is inclined with respect to the liquid level LS (the inclination angle of the bottom wall portion 77 with respect to the horizontal direction) θ5 is, for example, 10 to 25 °. The angle θ5 is preferably 15 to 20 °.
The vertical distance between the bottom wall portion 77 and the lower surface of the top wall member 75 decreases from the opening located at the radial outer end of the nozzle portion 74 toward the inner side in the radial direction.

The bottom wall portion 77 has an oil holding groove 82 and a liquid return groove 83.
A plurality of oil holding grooves 82 are provided in the bottom wall portion 77. The oil holding groove 82 is recessed downward in the bottom wall portion 77 and extends in the circumferential direction. The groove width of the oil holding groove 82 becomes smaller as it goes downward. In the illustrated example, the cross-sectional shape of the oil holding groove 82 (the shape of the cross section perpendicular to the circumferential direction) is V-shaped. The groove width of the oil holding groove 82 is constant along the circumferential direction. The groove depth of the oil holding groove 82 is constant along the circumferential direction.

The plurality of oil holding grooves 82 are arranged in the radial direction. The oil holding grooves 82 adjacent to each other in the radial direction are arranged adjacent to each other. In the example of the present embodiment, the oil holding groove 82 is arranged in a portion of the bottom wall portion 77 located above the liquid level LS.

A plurality of liquid return grooves 83 are provided in the bottom wall portion 77. The liquid return groove 83 is recessed downward in the bottom wall portion 77 and extends in the radial direction. The liquid return groove 83 extends from the radial inner end portion to the outer end portion of the bottom wall portion 77. The groove width of the liquid return groove 83 is constant along the vertical direction. The groove width of the liquid return groove 83 is constant along the radial direction. The groove width of the liquid return groove 83 is larger than the groove width of the oil holding groove 82. The bottom of the liquid return groove 83 is a flat surface perpendicular to the axis O. The groove depth of the liquid return groove 83 decreases as it goes outward in the radial direction. The groove depth of the liquid return groove 83 is larger than the groove depth of the oil holding groove 82.

The plurality of liquid return grooves 83 are arranged so as to be spaced apart from each other in the circumferential direction. In the example of the present embodiment, a plurality of liquid return grooves 83 (eight in the illustrated example) are arranged at equal intervals in the circumferential direction. The liquid return groove 83 is arranged so as to divide the oil holding groove 82 in the circumferential direction. The circumferential end of the oil holding groove 82 is connected to the liquid return groove 83. That is, the inside of the oil holding groove 82 communicates with the inside of the liquid return groove 83. The upper portion of the liquid return groove 83 is arranged above the liquid level LS, and the lower portion is arranged below the liquid level LS.

The oil holding hole 78 is a bottomed hole that is recessed downward from the upper surface of the bottom wall member 76. The oil holding hole 78 opens at the center of the upper surface of the bottom wall member 76. The oil holding hole 78 is a circular hole having an inner diameter larger than that of the peripheral wall of the main pipe 81. The inner peripheral surface of the oil holding hole 78 faces the lower end of the outer peripheral surface of the main pipe 81 with a gap in the radial direction. The inner peripheral surface of the oil holding hole 78 faces the suction hole 81h of the main pipe 81 with a radial gap. The floating oil F that has passed over the bottom wall portion 77 in the radial direction flows down into the oil holding hole 78 and is temporarily held. The floating oil F that has flowed down into the oil holding hole 78 is sucked into the main pipe 81 through the suction hole 81h.

The pipe fixing hole 79 is a bottomed hole that is recessed downward from the bottom surface of the oil holding hole 78. The pipe fixing hole 79 opens at the center of the bottom surface of the oil holding hole 78. The pipe fixing hole 79 is a circular hole. The inner diameter of the pipe fixing hole 79 is smaller than the inner diameter of the oil holding hole 78. The lower end of the main pipe 81 is inserted into the pipe fixing hole 79 and fixed. The pipe fixing hole 79 also functions as a cap for closing the lower end opening of the main pipe 81.

In this floating oil recovery device 20, when the suction source 17 is operated, the internal space of the nozzle portion 74 connected to the suction source 17 becomes a negative pressure, and the liquid D (mainly) near the liquid level LS from the opening of the nozzle portion 74. The floating oil F is the same as the following) and the outside air is sucked into.
The floating oil recovery device 20 sucks the liquid D and the outside air into the nozzle portion 74 and introduces them into the main pipe 81 (suction pipe portion 72). That is, the liquid D moves diagonally upward along the inclination of the bottom wall portion 77 in the nozzle portion 74 by the fluid suction force (air suction force) of the suction source 17, and enters the main pipe 81 through the suction hole 81h. Be drawn in.

The levitation oil tank 1 of the present embodiment described above also has the same effect as the levitation oil tank 1 of the first embodiment described above. Further, according to the floating oil recovery device 20 of the present embodiment, the same effect as that of the floating oil recovery device 10 of the first embodiment can be obtained.

Further, since the bottom wall portion 77 has a conical shape extending around the axis O of the suction pipe portion 72, the nozzle portion 74 can recover the floating oil F from all directions in the horizontal direction (over the entire circumference around the axis O). Therefore, the recovery efficiency of the floating oil F is stably increased.

Further, in the present embodiment, the bottom wall portion 77 has a plurality of oil holding grooves 82 extending in the circumferential direction, and the plurality of oil holding grooves 82 are arranged in the radial direction, so that the following effects can be obtained.
In this case, the floating oil F that rides on the bottom wall portion 77 is held by the plurality of oil holding grooves 82, and tends to stay on the bottom wall portion 77. Further, water or the like having a specific gravity larger than that of the floating oil F is collected at the bottom of the oil holding groove 82. The water or the like can be returned to the liquid level LS through the liquid return groove 83 connected to the circumferential end of the oil holding groove 82. Therefore, the recovery efficiency of the floating oil F is further improved.

Further, in the present embodiment, since the bottom wall portion 77 has the liquid return groove 83 extending in the radial direction, the following effects can be obtained.
In this case, of the floating oil F and the liquid D such as water that have run on the bottom wall portion 77, water or the like flows into the liquid return groove 83 and is returned to the liquid level LS through the liquid return groove 83. Therefore, the recovery efficiency of the floating oil F can be further improved.

Further, in the present embodiment, since the angle θ5 is 10 to 25 °, the following effects can be obtained.
Since the angle θ5 is 10 ° or more, water or the like easily flows diagonally downward from above the bottom wall portion 77. That is, the action of returning water or the like to the liquid level LS from above the bottom wall portion 77 can be stably obtained.
Since the angle θ5 is 25 ° or less, the floating oil F can be easily pulled diagonally upward from above the bottom wall portion 77 by the fluid suction force of the suction source 17. That is, the action of sucking and recovering the floating oil F from the bottom wall portion 77 can be stably obtained.
In order to make the above-mentioned action and effect more remarkable, the angle θ5 is preferably 15 to 20 °.

The present invention is not limited to the above-described embodiment, and the configuration can be changed without departing from the spirit of the present invention, for example, as described below.

The bubble generation nozzle 110 may generate microbubbles (bubbles) in the liquid D by a structure other than the structure described in the above-described embodiment.
The floating oil recovery devices 10 and 20 may recover the floating oil F from the liquid level LS by a structure other than the structure described in the above-described embodiment.

In addition, each configuration (component) described in the above-described embodiments, modifications, and notes may be combined as long as it does not deviate from the gist of the present invention, and addition, omission, replacement, and other configurations may be added. It can be changed. Further, the present invention is not limited to the above-described embodiments, but is limited only to the scope of claims.

According to the floating oil tank of the present invention, floating oil can be efficiently recovered. Therefore, it has industrial applicability.

1 ... Floating oil tank, 2 ... Tank, 2a ... Bottom wall, 2b ... Upstream vertical wall, 2d ... Horizontal wall, 4 ... Guide means, 5 ... Pump part, 8 ... First partition plate, 8a ... First main body part, 8b ... 1st telescopic part, 8c ... 1st sealing part, 9 ... 2nd partition plate, 9a ... 2nd main body part, 9b ... 2nd telescopic part, 9c ... 2nd sealing part, 10, 20 ... Floating oil recovery Device, 12,72 ... Suction tube part, 13 ... Float part, 14,74 ... Nozzle part, 17 ... Suction source, 45,46,48,50,77 ... Bottom wall part, 110 ... Bubble generation nozzle, 111 ... Cylinder Body, 112 ... Interior body, 115 ... Flow path, 130 ... Inflow side flow path, 131 ... Outflow side flow path, 132 ... Microbubble generation flow path, 132a ... Expanded flow path, 132b ... Reduced diameter flow path , A ... central axis, D ... liquid, F ... floating oil, FD ... first direction, LS ... liquid level, SD ... second direction

Claims (16)

A tank that stores liquids containing oil and
A bubble generating nozzle that is immersed in the liquid and emits bubbles into the liquid,
A floating oil recovery device that floats on the liquid surface of the liquid and recovers the floating oil.
Floating oil tank. A guide means arranged in the tank to guide the flow of the liquid is provided.
The floating oil tank according to claim 1. The guide means provides a first partition plate arranged on the downstream side of the bubble generating nozzle and on the upstream side of the floating oil recovery device in the first horizontal direction in which the liquid in the tank flows. Have and
In the first partition plate, the upper end portion of the first partition plate is located below the liquid level.
The floating oil tank according to claim 2. The mounting position of the first partition plate can be adjusted in at least one of the first direction and the vertical direction in the tank.
The floating oil tank according to claim 3. The tank has a pair of lateral walls that are spaced apart from each other in the second horizontal direction, which is orthogonal to the first direction.
The first partition plate is
The plate-shaped first main body and
It has a first telescopic portion that projects from the end of the first main body portion in the second direction so as to be expandable and contractible in the second direction and comes into contact with the lateral wall.
The floating oil tank according to claim 3 or 4. The first partition plate has a first sealing portion that seals a gap between the end portion of the first main body portion in the second direction and the lateral wall.
The floating oil tank according to claim 5. The tank
With the bottom wall
It has an upstream vertical wall connected to an upstream end of the bottom wall in the first horizontal direction in which the liquid flows in the tank.
A plurality of bubble generation nozzles are provided.
The guide means has a second partition plate arranged on the upstream side of at least one of the plurality of bubble generation nozzles and on the downstream side of the upstream vertical wall in the first direction.
The floating oil tank according to any one of claims 2 to 6. The mounting position of the second partition plate can be adjusted in at least one of the first direction and the vertical direction in the tank.
The floating oil tank according to claim 7. The tank has a pair of lateral walls that are spaced apart from each other in the second horizontal direction, which is orthogonal to the first direction.
The second partition plate is
The plate-shaped second main body and
It has a second telescopic portion that projects from the end of the second main body portion in the second direction so as to be expandable and contractible in the second direction and comes into contact with the lateral wall.
The floating oil tank according to claim 7 or 8. The second partition plate has a second sealing portion that seals a gap between the end portion of the second main body portion in the second direction and the lateral wall.
The floating oil tank according to claim 9. A plurality of bubble generation nozzles are provided at intervals in the first direction in which the liquid in the tank flows in the horizontal direction and in the second direction in the horizontal direction which is orthogonal to the first direction. Be,
The floating oil tank according to any one of claims 1 to 10. The bubble generating nozzle discharges bubbles upward in the liquid.
The floating oil tank according to any one of claims 1 to 11. The bubble generating nozzle discharges microbubbles into the liquid.
The floating oil tank according to any one of claims 1 to 12. The bubble generation nozzle
A cylinder having a central axis and extending in the axial direction of the central axis,
An interior body arranged inside the cylinder and
A flow path formed inside the cylinder is provided.
The flow path is
An inflow side flow path portion located at one end of the cylinder in the axial direction and
The outflow side flow path portion located at the end on the other side in the axial direction of the cylinder,
It has a microbubble generation flow path portion that is located between the inflow side flow path portion and the outflow side flow path portion in the axial direction and communicates with the inflow side flow path portion and the outflow side flow path portion. ,
The micro-bubble generation flow path portion is formed by an inner peripheral surface of the tubular body and an outer peripheral surface of the interior body.
The micro-bubble generation flow path portion is
A diameter-expanded flow path that increases in diameter toward the other side in the axial direction,
It has a diameter-reduced flow path portion that is arranged on the other side in the axial direction of the diameter-expanded flow path portion, communicates with the diameter-expanded flow path portion, and decreases in diameter toward the other side in the axial direction.
The floating oil tank according to claim 13. The floating oil recovery device is
The float part that floats on the liquid surface and
The suction tube portion supported by the float portion and
A nozzle portion connected to the suction pipe portion and arranged on the liquid surface, and a nozzle portion
A suction source that is connected to the suction pipe portion and sucks the floating oil on the liquid surface from the nozzle portion through the suction pipe portion is provided.
The nozzle portion has a bottom wall portion that extends incline toward the lower side as it is separated from the suction pipe portion in the horizontal direction and is inserted into the liquid surface.
The floating oil tank according to any one of claims 1 to 14. A pump unit that pumps the liquid from the bottom of the tank, pressurizes it, and sends it to the bubble generation nozzle.
The floating oil tank according to any one of claims 1 to 15.

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